im running transmission on my pi connected to openwrt running openvpn
the pi has ufw port 31603 open for transmission
i would like to forward tcp/udp for port 31603 from pi to gateway so as to bypass vpn
this does not seem to be working:
192.168.42.100 is the static ip of the pi192.168.0.1 is the gateway of the isp
As you are using a VPN, maybe try Policy Based routing:
Simply set the Pi's IP address to use the WAN.
Problem in your case could be that traffic for the Pi enters the WAN but is routed out by default via the VPN and the firewall will not allow this?
Edit: I see you are already using PBR so forget the above, although you might specify an outgoing interface?
no more space on router to install pbr
I only want transmission traffic to be routed to WAN, not all traffic from the pi
only need traffic from transmission port opened on the pi to be routed to wan, vpn does not allow torrent traffic
If you already have made an extra routing table which uses the WAN by default you can use an iprule to route a sourceport via the WAN.
Using fwmark to do this was not successful in my hands
So in your case something like:
ip rule add sport 31603 table XXX
Where XXX is the table with WAN gateway as default
root@OpenWrt:~# ip rule add sport 31603 table 100
ip: invalid argument 'sport' to 'ip'
Is this a really old router with Kernel < 5.10 ?
It works on my router:
root@DL-WRX36:~# ip rule add sport 31603 table 100
root@DL-WRX36:~# ip rule show
0: from all lookup local
32765: from all sport 31603 lookup 100
32766: from all lookup main
32767: from all lookup default
root@DL-WRX36:~#
EDIT:
you might try:
ip rule add from all sport 31603 table 100
ya
mine gives me
root@OpenWrt:~# ip rule add sport 31603 table 100
ip: invalid argument 'sport' to 'ip'
root@OpenWrt:~# ip rule add from all sport 31603 table 100
ip: invalid argument 'sport' to 'ip'
root@OpenWrt:~#
root@OpenWrt:~# ip rule show
0: from all lookup local
1: from 192.168.42.100 iif br-lan lookup 100
10000: from 192.168.42.1 lookup 1
20000: from all to 192.168.42.1/24 lookup 1
32766: from all lookup main
32767: from all lookup default
90012: from all iif lo lookup 1
tried, no joy 
uname -r
The sport option is not available on earlier kernel versions, I am not sure exactly when it was added.
It looks like you are out of luck 
root@OpenWrt:~# uname -r
5.10.176
root@OpenWrt:~#
daym
ip rule help should show what is available
root@DL-WRX36:~# ip rule help
Usage: ip rule { add | del } SELECTOR ACTION
ip rule { flush | save | restore }
ip rule [ list [ SELECTOR ]]
SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ]
[ fwmark FWMARK[/MASK] ]
[ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]
[ uidrange NUMBER-NUMBER ]
[ ipproto PROTOCOL ]
[ sport [ NUMBER | NUMBER-NUMBER ]
[ dport [ NUMBER | NUMBER-NUMBER ] ]
ACTION := [ table TABLE_ID ]
[ protocol PROTO ]
[ nat ADDRESS ]
[ realms [SRCREALM/]DSTREALM ]
[ goto NUMBER ]
SUPPRESSOR
SUPPRESSOR := [ suppress_prefixlength NUMBER ]
[ suppress_ifgroup DEVGROUP ]
TABLE_ID := [ local | main | default | NUMBER ]
root@DL-WRX36:~#
root@OpenWrt:~# ip rule help
ip: invalid argument 'help' to 'ip'
root@OpenWrt:~#
looks cool 
Another idea maybe it is dependant on the ip package you have e.g. ip-full package versus something else.
So maybe by adding another package you can add it?
Just a wild guess
just curious,
when you added
how did it look on luci, i mean where did the port number show up in luci network > routing > ip rules
guess it does not show in
LuCi Status >network > routing > ip rules
anyway, thanks for your help, appreciate it
Transmission doesn't use the same source port for outgoing connections, so trying to match on sport 31603 is futile.
ive made a ufw rule on the pi to only allow that specific port
so even if transmission running on the pi is doing something dynamically, the pi will only allow outgoing connections through that port
dont know if that makes any sense, i dont have sport anyway
