On Wed, May 15, 2019 at 09:09:34AM +0000, Adrichem, N.L.M. (Niels) van wrote: > Hello, > > Additionally, the bird.log file throws the following error: > 2019-05-15 10:27:21.869 <INFO> Started > 2019-05-15 10:27:21.902 <WARN> Missing broadcast address for interface vxlan0 > 2019-05-15 10:27:29.329 <ERR> KRT: Received route 10.0.1.3/32 with strange > next-hop 10.0.1.4 >
> It may be that kernel protocol rejects the route because the next-hop > is not in the interface its regular netmask (which is set to /32), though > I am not familiar enough with the source code to determine the exact > cause except that the error gets thrown from sysdep/linux/netlink.c line > 1643. However, I think the line should be accepted since there is another > routing rule confirming that the next-hop is directly attached to device > eth1. Given the explicit error I don't think this is a configuration > error (though I am open to learn more), so I hope BIRD can be patched to > solve this. Hello BIRD generally expects that next hop is resolvable through an address range associated with interfaces, not just through another direct/device route. This is limitation compared to the Linux kernel which allows next hop resolvable through another direct/device route (but not through another regular route with next-hop). We have some plans to redesign it in a more generic manner, but it is not a simple fix. As a workaround, attached patch (untested) should disable next hop checking for all alien routes. -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."
diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c index d773743d..d5d64b6b 100644 --- a/sysdep/linux/netlink.c +++ b/sysdep/linux/netlink.c @@ -1632,7 +1632,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) if ((i->rtm_family == AF_INET6) && ipa_in_netX(ra->nh.gw, (net_addr *) &sit)) return; - if (i->rtm_flags & RTNH_F_ONLINK) + if ((i->rtm_flags & RTNH_F_ONLINK) || (krt_src == KRT_SRC_ALIEN)) ra->nh.flags |= RNF_ONLINK; neighbor *nbr;
