Allow UDP traffic only via specific wan

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello Friends,

It's been a long time since I am stuck with my requirement. Will be more satisfied with anyone's support.

I am having more than 1 WAN in my OpenWRT device, the thing is I need to allow UDP traffic to be routed only via a specific WAN which I decide.

I've used PBR for this requirement, but unfortunately, it won't well for UDP seems.
Is there any other possible to aceuve my requirement.(by iptables rule or anything else)?.

2
  1. mwan3 package
  2. a set of rules/routes
3

If Possible can you please post any example configuration?

4

In mwan3 it's self explanatory. To make a rule you'd have to mark the interesting traffic with iptables rule.

1 Like
5

Hi @trendy
As per your suggestion, I've gone through the mwan3 documentation and managed to make one rule which suits my requirement.

config rule 'wg7_wan1'
        option dest_port '51821'
        option proto 'udp'
        option use_policy 'wan1_only'

config policy 'wan1_only'
        list use_member 'bal_wan1_m1_w34'

config member 'bal_wan1_m1_w34'
        option interface 'wan1'
        option metric '1'
        option weight '34'

config interface 'wan1'
        option enabled '1'
        option initial_state 'offline'
        option family 'ipv4'
        option timeout '4'
        option up '2'
        option down '2'
        option count '1'
        option interval '10'
        option reliability '1'
        list track_ip 'inseego.com'
        list track_ip '8.8.4.4'

So here I have made a rule that all my UDP traffic with port number 51821 should go via wan1.

As you mentioned,

  1. mwan3 package
  2. a set of rules/routes ----> How my rules/routes should be as per my requirement?
6

I think, it is not possible, so advice from @trendy is common, but not applicable in any case (like separate just by protocol without port number).