Source-address or source-interface for ntp, dns, etc

General questions
, ,
1

Hi

Is it possible to bind DNS, NTP, etc VyOS router client requests to specific interface?

like cisco
ip domain lookup source-interface vlan 1
ntp source vlan 1

2

Try listen-address:

set service snmp listen-address x.x.x.x
set system ntp listen-address x.x.x.x

3

Sorry, I think that my question was not clear.

I would like to ask about binding source interface for traffic initiated from VyOS to another host. (traceroute, ping and DNS resolving if hostaname used)

4

We don’t have such bindings.
You can set services to listen to specific addresses.
Or use ping x.x.x.x interface x,x,x,x
Or use PBR rules.

5

I believe you created good quality items in functions also. Keep working, congrats!

6

PBR rules could be effective, but I don’t see a way to set a source IP for an outbound connection via that method - only an outbound interface/next-hop. Does changing the egress interface via PBR change the source address of the packets to the IP of that particular interface?

7

Source port /dest port/mark/protocol/source address/ destination address and other options
Look at “policy local-route”

8

using sNAT rules, you can overrule the source address. So for instance, syslog message always seem to originate from some loopback address, instead of primary/backup interface IP.

9

I didnt try that, but theres a comand in CLI:

set service ntp interface lo

Probably its only for configuring a NTP Server on the VyOS router itself