> I think that is telling you not to use /32 address on interface for which you > expect there to be connected peers. > From an IP networking perspective, if you want two peers to be connected on > an interface, they need to be within the same subnet, so use a /31.
For p2p links there are actually two valid approaches to IP subnetting. The BSD approach where you have to independent /32s on each side and a routing entry for the other side. Or a connected route /31 or larger. The act of configuring an address with a prefix is really a shortcut for configuring the address _and_ the connected prefix of course. Sounds to me like the SAS algorithm needs a bit of work. (I'd like to use it for ICMP error sending too, where it also should handle the case of picking a source address from another interface than the outgoing interface). Cheers, Ole > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Artem Glazychev > via lists.fd.io <artem.glazychev=xored....@lists.fd.io> > Date: Wednesday, 4 August 2021 at 08:37 > To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> > Subject: [vpp-dev] memif: failed: no source address for egress interface > > Hello, > Found a problem with some types of interfaces. > > For example, memif. When I'm creating memif interfaces and run ping I see: > > DBGvpp# ping 10.10.2.1 > Failed: no source address for egress interface > ... > > But it is worth mentioning that I am setting /32 mask for IP address > > Managed to fix IP mode with these patches: > https://gerrit.fd.io/r/c/vpp/+/32801, https://gerrit.fd.io/r/c/vpp/+/33303 > > But Ethernet mode still doesn't work. > > ============================== > > There was already a similar topic: > https://lists.fd.io/g/vpp-dev/topic/84038840 > > Created a jira issue with details: https://jira.fd.io/browse/VPP-1992 > > Does anyone have any thoughts on this? Thank you. > > > > > > > > > > > >
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