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Maniphest T2279

Router resolves as 127.0.1.1 when using Router's Recursive DNS
Closed, ResolvedPublicBUG
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Description

Hi,

When using the router's local instance of pdns as the DNS resolver for clients, the hostname configured for the router is resolved as 127.0.1.1
This makes it impossible to SSH or SNMP monitor the router using its DNS name.

set system host-name 'ferrari'
set system domain-name '<mydomain>.com'
tim@ferrari# show interfaces ethernet eth1 | commands
set address '192.168.0.1/24'

[edit service dns forwarding]
tim@ferrari# show | commands
set allow-from '192.168.0.0/24'
set allow-from '10.1.1.0/24'
set cache-size '8192'
set listen-address '192.168.0.1'
set name-server 'x.x.x.39'
set name-server 'x.x.x.40'


set host-name ferrari.<mydomain>.com inet '192.168.0.1'

DNS lookup from a Unix client

{16:38}~ ➭ dig @192.168.0.1 ferrari.<mydomain>.com

; <<>> DiG 9.11.5-P4-5.1-Debian <<>> @192.168.0.1 ferrari.<mydomain>.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 692
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;ferrari.<mydomain>.com.           IN      A

;; ANSWER SECTION:
ferrari.<mydomain>.com.    86400   IN      A       127.0.1.1

;; Query time: 0 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Mon Apr 13 16:38:43 NZST 2020
;; MSG SIZE  rcvd: 64

It would be better if the DNS name of the router as configured in static-host-mapping could be returned.

Details

Difficulty level
Unknown (require assessment)
Version
1.3-rolling-202004110117
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

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Event Timeline

tjh created this task.Apr 13 2020, 4:43 AM
tjh updated the task description. (Show Details)Apr 13 2020, 6:51 AM
Codec subscribed.Apr 26 2020, 4:16 PM
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jjakob added a parent task: T2464: DNS bugs (parent task).May 15 2020, 9:36 PM
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Viacheslav added a project: VyOS 1.5 Circinus.
Viacheslav added a subscriber: jjakob.
Viacheslav subscribed.EditedApr 26 2024, 12:05 PM

It looks working on VyOS 1.5-rolling-202404260019

set system domain-name 'vyos.local'
set system host-name 'r4'
set system static-host-mapping host-name r4.vyos.local inet '100.64.0.14'

set service dns forwarding allow-from '100.64.0.0/24'
set service dns forwarding listen-address '100.64.0.14'
set service dns forwarding name-server 1.1.1.1
set service dns forwarding name-server 8.8.8.8

check:

vyos@r1-right:~$ dig +short @100.64.0.14 r4.vyos.local
100.64.0.14
vyos@r1-right:~$

The same works on VyOS 1.4-stable-202404120309

set system domain-name 'example.local'
set system host-name 'r15'
set system static-host-mapping host-name r15.example.local inet '192.168.122.15'

set service dns forwarding allow-from '192.168.122.0/24'
set service dns forwarding listen-address '192.168.122.15'
set service dns forwarding name-server 1.1.1.1
set service dns forwarding name-server 8.8.8.8

Check:

vyos@r1-right:~$ dig +short @192.168.122.15 r15.example.local
192.168.122.15
vyos@r1-right:~$

Most likely was fixed in https://vyos.dev/T4270
For 1.3.6 still bug

vyos@r4:~$ dig +short @192.168.122.11 r1.example.local 
127.0.1.1
vyos@r4:~$

The template https://github.com/vyos/vyos-1x/blob/a5f847beab098f6d316f7c925509c7aa9a76e21f/data/templates/vyos-hostsd/hosts.tmpl#L6

Viacheslav edited projects, added VyOS 1.4 Sagitta (1.4.0-epa3); removed VyOS 1.4 Sagitta.Apr 26 2024, 12:06 PM
Viacheslav moved this task from Need Triage to Finished on the VyOS 1.5 Circinus board.
Viacheslav moved this task from Need Triage to Finished on the VyOS 1.4 Sagitta (1.4.0-epa3) board.
Viacheslav assigned this task to c-po.Apr 26 2024, 1:44 PM
Viacheslav closed this task as Resolved.Apr 29 2024, 8:29 AM
Viacheslav moved this task from Need Triage to Finished on the VyOS 1.3 Equuleus (1.3.7) board.

Fixed in the commit https://github.com/vyos/vyos-1x/commit/b75e0ba0a297fd64307960f98f30c27a689deab7