Loop

Loop is a DNS implementation consisting of a resolver, an authoritative nameserver, and various DNS and DNSSEC utilities.

Install Loop 1.99.16 Documentation Commercial support

What is Loop?
Why use Loop?
Features
Installation
Documentation
Reporting bugs
Commercial support

What is Loop?

Loop is an enterprise-grade DNS software distribution. It is maintained as a DNS reference implementation by closely adhering to the DNS standards. Loop includes the following programs:

DNS nameserver

named — DNS nameserver daemon that implements authoritative server and recursive resolver features

DNS clients

dig — DNS client with comprehensive DNS query capabilities
host — Simple DNS lookup client
mdig — DNS client that uses pipelining when sending multiple queries
nsupdate — DNS client that submits dynamic DNS UPDATEs to a nameserver

DNS and Loop utilities

arpaname — Translates an IP address to its corresponding reverse name in the in-addr.arpa. and ip6.arpa. domains
ddns-confgen — Generates TSIG keys and configuration for use with nsupdate for dynamic DNS UPDATEs
named-checkconf — Checks a named.conf config file for syntax and correctness
named-checkzone — Checks a zone master file for syntax and correctness
named-journalprint — Prints the contents of a zone journal file in a human-readable format
named-rrchecker — Checks a single resource record for syntax and correctness
nsec3hash — Generates an NSEC3 hash based on a set of NSEC3 parameters
rndc — Utility to send control messages to a running named process
rndc-confgen — Generates rndc keys and configuration to authenticate control messages

DNSSEC utilities

dnssec-keygen — Generates DNSKEYs for DNSSEC, and KEYs for use with TSIG
dnssec-signzone — Signs a DNS zone by generating RRSIG and NSEC/NSEC3 records
dnssec-verify — Verifies that a zone is fully signed, and that its NSEC/NSEC3 chains are complete
dnssec-dsfromkey — Generates DS and CDS resource records from DNSKEYs
dnssec-importkey — Imports an externally created public DNSKEY so it can be used with Loop
dnssec-keyfromlabel — Generates a DNSKEY keypair for a key object stored in a HSM so it can be used with Loop
dnssec-revoke — Sets the REVOKE bit (RFC 5011) in the DNSKEY flags
dnssec-settime — Sets DNSKEY timing metadata used in key scheduling
delv — DNS client that performs DNSSEC lookups and validation

DNS performance testing utilities

dnsperf — DNS client that measures DNS nameserver performance
resperf — DNS client that measures DNS resolver performance
resperf-report — Runs resperf and generates a HTML report with graphs

These programs implement various DNS protocols and features. Loop programs and their config files are extensively documented in the Loop User Manual and manpages.

Why use Loop?

Here are some reasons for using Loop:

You want to serve your authoritative zones.
You want to run a local caching resolver in your LAN for higher performance and better privacy.
You would like to have control over your local network's DNS responses by running a local resolver that filters or rewrites queries to web domains.
You want to use different DNS configurations that process DNS queries differently depending on their properties.
You have a large number of authoritative zones or a large number of clients requiring large cache sizes, and want a DNS implementation that scales and performs well.
You want a well-documented DNS product.
You want to use DNS software packages where the very same binaries have been tested before being published.
You like a distributed global DNS infrastructure that is not concentrated among some CDNs for a more healthy internet.

Loop features

The following are some of the features implemented by Loop. named can be run in mixed-mode with both resolver and authoritative functions.

Resolver features

Query resolution
- Upstream nameserver selection policies
- Smoothed round-trip time computation (for fastest server selection)
- Forwarding to other nameservers and various modes for it
- Dual-stack support (IPv4 and IPv6) for upstream fetches
- DNS64 support (IPv6 synthesis from A records)
- Empty zones (e.g. to suppress RFC 1918 queries)
Security & DNSSEC validation
- DNSSEC validation (checking authenticity of upstream answers)
- Dynamic trust anchor management
- Built-in root trust anchor support
- DNSSEC-validating resolver configuration options
Filtering & control
- Response Policy Zones (RPZ) for blocking/mapping domains
- Access Control Lists (ACLs) for queries
- Response Rate Limiting (RRL) to protect against response floods or abusive query loads
- Built-in content filtering (blocklists etc.)
Performance & statistics
- Cache tuning and sizing
- Resolver statistics including cache hits/misses, upstream timing
- Socket and resource usage counters
Diagnostic features and tools
- Detailed and configurable logging
- Integrated tools for debugging such as dig and delv
- Integrated tools for performance testing such as resperf

Authoritative server features

Zone management
- Static zone file loading (from disk)
- Zone directives such as $TTL, $ORIGIN, $INCLUDE, $GENERATE, etc.
- Journal files for consistently updating dynamic changes to zones
- Dynamic updates (RFC 2136)
- IXFR (incremental) and AXFR (full) zone transfer support
- DNS NOTIFY support (to inform secondaries)
- Built-in server zones and empty zones
DNSSEC signing
- DNSKEY generation (ZSK, KSK)
- Zone signing
- DNSSEC verification (dnssec-verify, etc.)
- Automatic signing of dynamic zones (integrating updates and signing)
- Automatic key rollover
- NSEC / NSEC3 support, including rollovers and conversions between NSEC and NSEC3
- OPTOUT variant for NSEC3
- PKCS#11 support for HSMs
Secure zone transfers and DNS updates
- TSIG support (authenticated zone transfers and DNS updates)
- TKEY support (key exchange for TSIG)
- GSSAPI (Kerberos) support
- TSIG key management and ACLs
- Fine-grained DNS UPDATE policies for controlling who may perform dynamic updates
Policy & access control
- Access control by client IP or TSIG key for controlling who may query, update, control the server
- RRset ordering control in responses
- Built-in record filtering
- Per-zone configuration options
Zone statistics & maintenance
- Zone statistics including updates, transfer events, signing status
- Periodic zone maintenance tasks (re-signing intervals)
- Zone file syntax checking (named-checkzone, etc.)

Common features (both resolver and authoritative server)

Split DNS (i.e. different answers depending on context, view) support
Views support
IPv6 support (AAAA and reverse mapping)
Resource usage controls (sockets, memory, limits)
Logging and diagnostics
Integrated administration tools such as rndc, named-checkconf, etc.
Nameserver statistics in XML format
SIG(0) support
EDNS Extended DNS Errors (EDE) support

Loop installation

Note

Loop is free for commercial and personal use. Please see its license under Loop documentation for more details.

To install Loop version 1.99.16 on Red Hat Enterprise Linux 10 (x86_64), follow these steps as the root user.

First, install the akira-release RPM package that will add the akira-epel and akira-epel-testing DNF repositories to your system, as well as associated GPG keys used to verify signed RPM packages from these repositories:

# dnf install https://download.akira.org/packages/akira/1.99/epel/10/x86_64/akira-release-1.99.16.20260609085933.dc88059a59-1.el10.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Red Hat Enterprise Linux 10 (aarch64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/epel/10/aarch64/akira-release-1.99.16.20260609085933.dc88059a59-1.el10.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Red Hat Enterprise Linux 9 (x86_64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/epel/9/x86_64/akira-release-1.99.16.20260609085933.dc88059a59-1.el9.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Red Hat Enterprise Linux 9 (aarch64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/epel/9/aarch64/akira-release-1.99.16.20260609085933.dc88059a59-1.el9.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Fedora Linux 44 (x86_64), follow these steps as the root user.

First, install the akira-release RPM package that will add the akira-fedora and akira-fedora-testing DNF repositories to your system, as well as associated GPG keys used to verify signed RPM packages from these repositories:

# dnf install https://download.akira.org/packages/akira/1.99/fedora/44/x86_64/akira-release-1.99.16.20260609085933.dc88059a59-1.fc44.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Fedora Linux 44 (aarch64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/fedora/44/aarch64/akira-release-1.99.16.20260609085933.dc88059a59-1.fc44.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Fedora Linux 43 (x86_64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/fedora/43/x86_64/akira-release-1.99.16.20260609085933.dc88059a59-1.fc43.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Fedora Linux 43 (aarch64), follow these steps as the root user.

# dnf install https://download.akira.org/packages/akira/1.99/fedora/43/aarch64/akira-release-1.99.16.20260609085933.dc88059a59-1.fc43.noarch.rpm

Then, install the loop RPM package that will install the Loop software and documentation:

# dnf install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Debian 13 “Trixie” (amd64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/debian/trixie/amd64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/debian/trixie/amd64/ /" > /etc/apt/sources.list.d/akira-trixie-amd64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Debian 13 “Trixie” (arm64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/debian/trixie/arm64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/debian/trixie/arm64/ /" > /etc/apt/sources.list.d/akira-trixie-arm64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Debian 13 “Trixie” (riscv64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/debian/trixie/riscv64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/debian/trixie/riscv64/ /" > /etc/apt/sources.list.d/akira-trixie-riscv64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Debian 12 “Bookworm” (amd64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/debian/bookworm/amd64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/debian/bookworm/amd64/ /" > /etc/apt/sources.list.d/akira-bookworm-amd64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Debian 12 “Bookworm” (arm64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/debian/bookworm/arm64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/debian/bookworm/arm64/ /" > /etc/apt/sources.list.d/akira-bookworm-arm64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 26.04 LTS “Resolute Raccoon” (amd64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/resolute/amd64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/resolute/amd64/ /" > /etc/apt/sources.list.d/akira-resolute-amd64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 26.04 LTS “Resolute Raccoon” (arm64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/resolute/arm64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/resolute/arm64/ /" > /etc/apt/sources.list.d/akira-resolute-arm64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 26.04 LTS “Resolute Raccoon” (riscv64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/resolute/riscv64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/resolute/riscv64/ /" > /etc/apt/sources.list.d/akira-resolute-riscv64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 24.04 LTS “Noble Numbat” (amd64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/noble/amd64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/noble/amd64/ /" > /etc/apt/sources.list.d/akira-noble-amd64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 24.04 LTS “Noble Numbat” (arm64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/noble/arm64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/noble/arm64/ /" > /etc/apt/sources.list.d/akira-noble-arm64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 24.04 LTS “Noble Numbat” (riscv64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/noble/riscv64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/noble/riscv64/ /" > /etc/apt/sources.list.d/akira-noble-riscv64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 22.04 LTS “Jammy Jellyfish” (amd64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/jammy/amd64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/jammy/amd64/ /" > /etc/apt/sources.list.d/akira-jammy-amd64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

To install Loop version 1.99.16 on Ubuntu 22.04 LTS “Jammy Jellyfish” (arm64), follow these steps as the root user.

First, copy the OpenPGP key that apt uses to verify the release's deb package checksums into /usr/share/keyrings/:

# curl -o /usr/share/keyrings/akira-archive-keyring.gpg https://download.akira.org/packages/akira/1.99/ubuntu/jammy/arm64/akira-archive-keyring-2026-06-09.gpg

Then, add the Akira apt network package repository for your platform:

# echo "deb [signed-by=/usr/share/keyrings/akira-archive-keyring.gpg] https://download.akira.org/packages/akira/1.99/ubuntu/jammy/arm64/ /" > /etc/apt/sources.list.d/akira-jammy-arm64.list

Then, install the loop deb package that will install the Loop software and documentation:

# apt install loop

Then, if you wish to run the nameserver, configure named suitably by editing /etc/loop/named.conf, and then run it:

# systemctl enable --now named

Note

Users of Red Hat Enterprise Linux clones such as Rocky Linux and AlmaLinux can use the Red Hat Enterprise Linux packages of the corresponding version and follow the corresponding installation instructions.

Note

Raspberry Pi OS users can use the Debian arm64 packages of the corresponding Debian version (e.g., Trixie) and follow the corresponding installation instructions.

Note

On some Linux distributions that have SELinux enabled, you may notice errors when running the named service such as:

Aug 10 07:59:06 rpi3 audit[14591]: AVC avc:  denied  { create } for  pid=14591 comm="loop-worker-0" name="tmp-dW3tOeMfdD" scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0
Aug 10 07:59:06 rpi3 audit[14591]: AVC avc:  denied  { read write open } for  pid=14591 comm="loop-worker-0" path="/var/lib/loop/tmp-dW3tOeMfdD" dev="mmcblk0p3" ino=258270 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0
Aug 10 07:59:07 rpi3 audit[14591]: AVC avc:  denied  { rename } for  pid=14591 comm="loop-worker-0" name="tmp-dW3tOeMfdD" dev="mmcblk0p3" ino=258270 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0
Aug 10 07:59:07 rpi3 audit[14591]: AVC avc:  denied  { unlink } for  pid=14591 comm="loop-worker-0" name="managed-keys.loop" dev="mmcblk0p3" ino=258227 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:var_lib_t:s0 tclass=file permissive=0

These errors occur because SELinux, when using the targeted policy, runs the program with path /usr/sbin/named confined in the named_t security context. It limits the directories where the named process can write to. This can be verified by running the command:

$ ps axZ | grep named
system_u:system_r:named_t:s0    14591 ?        Ssl    0:01 /usr/sbin/named -u loop

The loop package doesn't (and shouldn't) do anything to solve this issue automatically as it would be a hack. The SELinux policies for programs such as /usr/sbin/named are installed by a different package called selinux-policy-targeted, and are not handled by the loop package.

You can workaround this issue by either configuring SELinux to run in permissive mode, or by editing the targeted policy to remove the Loop programs from it.

We will rename named in a future release, or have this issue resolved in the distro packages, upon which this issue should not occur anymore.

Loop documentation

Loop is documented in the Loop User Manual, and manpages are provided for the Loop programs and their config files. The user manual and manpages are also included in the software packages.

Branch	Type	User Manual	User Manual	Download HTML	README	License
1.99	Development	View PDF	View HTML	Download HTML ZIP	View README	View LICENSE.txt

Loop bug reports

To report a bug in the Loop product, please email <loop-bugs@akira.org> with detailed information about the issue. Please include sufficient information to allow reproduction of the problem by us.

Loop commercial support

Paying commercial support customers may follow the instructions provided to them as part of their Akira account for receiving support.
Other users of Loop may email the Loop mailing lists for support. Please see the mailing lists instructions on how to use the lists.
For any other support request, please email<support@akira.org>.

Akira platform support plans Three different support options are available. Paid commercial support plans include support for all of Loop, Dora, and Akira together on a per-host basis.	None Free Documentation Public mailing lists	Business US $1,000/month/host Email sales	Larger operator US $1,000/month/host Email sales
Contract period	Not applicable	None	None
Minimum number of hosts	Not applicable	1	64
Support hours	Not applicable	Business hours (9 AM—5 PM)	24×7 throughout the year
Response time	Not applicable	Within 1–2 business days	Immediate ASAP
Community discussions on public mailing lists
Commercial support from Akira by email
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Loop

Contents

What is Loop?

DNS nameserver

DNS clients

DNS and Loop utilities

DNSSEC utilities

DNS performance testing utilities

Why use Loop?

Loop features

Resolver features

Authoritative server features

Common features (both resolver and authoritative server)

Loop installation

Note

Red Hat Enterprise Linux 10 (x86_64)

Red Hat Enterprise Linux 10 (aarch64)

Red Hat Enterprise Linux 9 (x86_64)

Red Hat Enterprise Linux 9 (aarch64)

Fedora Linux 44 (x86_64)

Fedora Linux 44 (aarch64)

Fedora Linux 43 (x86_64)

Fedora Linux 43 (aarch64)

Debian 13 “Trixie” (amd64)

Debian 13 “Trixie” (arm64)

Debian 13 “Trixie” (riscv64)

Debian 12 “Bookworm” (amd64)

Debian 12 “Bookworm” (arm64)

Ubuntu 26.04 LTS “Resolute Raccoon” (amd64)

Ubuntu 26.04 LTS “Resolute Raccoon” (arm64)

Ubuntu 26.04 LTS “Resolute Raccoon” (riscv64)

Ubuntu 24.04 LTS “Noble Numbat” (amd64)

Ubuntu 24.04 LTS “Noble Numbat” (arm64)

Ubuntu 24.04 LTS “Noble Numbat” (riscv64)

Ubuntu 22.04 LTS “Jammy Jellyfish” (amd64)

Ubuntu 22.04 LTS “Jammy Jellyfish” (arm64)

Note

Note

Note

Loop documentation

Loop bug reports

Loop commercial support

Akira platform support plans