Patrick Welche <pr...@cam.ac.uk> writes: > On Wed, May 23, 2018 at 11:03:38PM +0100, Mike Pumford wrote: >> I'm going to be attempting to reproduce it in npf as well as I've got an >> updated firewall box to deploy which I'm hoping will use npf instead of ipf >> (assuming I can make npf do everything I want). > > FWIW I'm going back to ipf: AFAICT keep state with ipf sends replies back > through the interface the requests came in on, but npf obeys the routing > table. It seems I was relying on ipf's behaviour. Feature? Bug?
To first order, a firewall should pass/drop, and not adjust routing, unless there's some extra rule which makes an affirmative request to grab a packet and reroute it contrary to the routing table. keep state is just a 2nd-order rule to add temporary rules for replies to packets seen in one direction. So I think you are relying on a probably-bug. If you disable the firewall briefly, does your system still work? (Or do you think it would, if you don't want to?)
signature.asc
Description: PGP signature
