Re: Duplicates IP packets when using CARP and ECMP routes.
- In reply to: Alexander Chernikov: "Re: Duplicates IP packets when using CARP and ECMP routes."
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Date: Mon, 01 May 2023 14:08:18 UTC
Thanks for the info. I opened the PR : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271168 Arnaud Houdelette-Langlois Administrateur des infrastructures systèmes et réseaux Normandie Université +33 2 31 56 69 54 Le 29/04/2023 à 23:44, Alexander Chernikov a écrit : > > > On Sat, 29 Apr 2023, at 11:01 AM, Arnaud Houdelette-Langlois wrote: >> >> Hi. >> >> We got a freebsd router with both ospf/bpg and multipath routes >> (ECMP) (using the new bird2 with netlink) . >> >> The router got an interface with carp enabled on it (gateway for >> admin vlan). >> >> Packets received on the carp address gets routed on all known routes >> towards destination. Thus, the destination host receives duplicates >> ip packets. (which disrupts most udp based protocols) >> >> Using a simple alias instead of carp solve the problem. Is this a >> known problem, or should I fill a PR ? >> > No, that’s not a known problem. > Please do open the PR with details. >> -- >> Arnaud Houdelette-Langlois >> Administrateur des infrastructures systèmes et réseaux >> Normandie Université >> +33 2 31 56 69 54 >> > > /Alexander