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System DNS Server Order Incorrect
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Description

The order of nameservers in /etc/resolv.conf in VyOS does not currently reflect the order in which those nameservers are added and committed, which is necessary for situations where domains are only resolvable by specific nameservers. The /etc/resolv.conf file is parsed in order, so if the first nameserver that is queried in the list returns NXDOMAIN, the domain will not resolve, even if later nameservers do in fact have a record for it.

(ignore the 209 DNS servers, those are in bug report T1714)

vyos@cr01-vyos# set system name-server 192.168.1.1                                              
[edit]                                                                                          
vyos@cr01-vyos# set system name-server 8.8.8.8                                                  
[edit]                                                                                          
vyos@cr01-vyos# set system name-server 1.1.1.1                                                  
[edit]                                                                                          
vyos@cr01-vyos# commit                                                                          
[edit]                                                                                          
vyos@cr01-vyos# cat /etc/resolv                                                                 
resolvconf/  resolv.conf                                                                        
[edit]                                                                                          
vyos@cr01-vyos# cat /etc/resolv.conf                                                            
                                                                                                
### Autogenerated by VyOS ###                                                                   
### Do not edit, your changes will get overwritten ###                                          
                                                                                                
nameserver 1.1.1.1                                                                              
nameserver 192.168.1.1                                                                          
nameserver 8.8.8.8                                                                              
nameserver 209.18.47.61                                                                         
nameserver 209.18.47.62                                                                         
                                                                                                
domain <removed>                                                                        
search <removed>

Details

Difficulty level
Unknown (require assessment)
Version
VyOS 1.2-rolling-201910050117
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

Related Objects
Search...

StatusSubtypeAssignedTask
 OpenNoneT2464 DNS bugs (parent task)
 ResolvedBUGViacheslavT1715 System DNS Server Order Incorrect

Event Timeline

trae32566 created this task.Oct 6 2019, 6:33 PM
pasik added a subscriber: pasik.Oct 6 2019, 9:11 PM
syncer changed the task status from Open to Needs testing.Nov 16 2019, 11:14 PM
syncer assigned this task to Viacheslav.
syncer triaged this task as Low priority.
syncer edited projects, added VyOS 1.3 Equuleus; removed VyOS 1.2 Crux.
trae32566 added a comment.EditedNov 17 2019, 7:04 PM

It looks like this is indeed fixed now!

vyos@cr01-vyos:~$ cat /etc/resolv.conf 

### Autogenerated by VyOS ###
### Do not edit, your changes will get overwritten ###

nameserver fd52:d62e:8011:ffff:192:168:255:1
nameserver 192.168.255.1
nameserver 1.1.1.1
nameserver 209.18.47.61
nameserver 209.18.47.62

search tx.rr.com
vyos@cr01-vyos:~$ show conf com | grep 'system name-server'
set system name-server 'fd52:d62e:8011:ffff:192:168:255:1'
set system name-server '192.168.255.1'
set system name-server '1.1.1.1'

Note that T1714 is still present, and search domains (search and domain in /etc/resolv.conf) appear to be entirely missing other than the DHCP received one.

Thank you 😄

Viacheslav added a comment.EditedDec 4 2019, 6:40 PM

This bug is fixed in latest rolling releases 1.3.
Tested on

[email protected]# run show vers
Version:          VyOS 1.3-rolling-201912040242

But on 1.2 the problem remains (after reboot).

[email protected]:~$ sh configuration commands | match name-ser
set system name-server '192.168.122.1'
set system name-server '8.8.8.8'
set system name-server '1.1.1.1'
[email protected]:~$ sudo cat /etc/resolv.conf 

### Autogenerated by VyOS ###
### Do not edit, your changes will get overwritten ###

nameserver 8.8.8.8
nameserver 192.168.122.1
nameserver 1.1.1.1
[email protected]:~$ sh version 
Version:          VyOS 1.2-rolling-201912030217
trae32566 added a comment.Dec 5 2019, 7:27 AM
This comment was removed by trae32566.
jjakob added a parent task: T2464: DNS bugs (parent task).May 15 2020, 9:36 PM
Viacheslav closed this task as Resolved.Jul 24 2020, 1:45 PM

Fixed, VyOS 1.3-rolling-202007240117

set system name-server 192.168.122.1
set system name-server 8.8.8.8      
set system name-server 1.1.1.1

Reboot

vyos@r1-roll:~$ sudo cat /etc/resolv.conf 
### Autogenerated by VyOS ###
### Do not edit, your changes will get overwritten ###

# system
nameserver 192.168.122.1
nameserver 8.8.8.8
nameserver 1.1.1.1
c-po moved this task from Need Triage to Finished on the VyOS 1.3 Equuleus board.Aug 3 2020, 3:27 PM
erkin set Issue type to Bug (incorrect behavior).Aug 31 2021, 6:39 PM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.0); removed VyOS 1.3 Equuleus.Aug 29 2022, 7:13 PM
syncer moved this task from Need Triage to Finished on the VyOS 1.3 Equuleus (1.3.0) board.