Hi Andreas, > Further investigation show that the "tx frame not ready" error counter on > the interface is going up. > > show errors > Count Node Reason > [...] > 1674 host-ens224-tx tx frame not ready > 3020 host-ens224-tx tx sendto temporary > failure
Those errors means the kernel does not send packets we push into the tx queue. This could be because the kernel is too slow, but more often than not because the interface is down on Linux side. Make sure it is up with eg. 'sudo ip l set dev ens224 up'. Also make sure that nothing mess up with the interface (eg. netplan, system-networkd, dhcpd, network-manager or god knows what they will invent next...). ben > It seems that somehow the interface is messed up. Anything I can do to > debug this further? > > VPP is current from master branch, OS is Ubuntu 18.04.4 with the 5.3.0-42- > generic kernel. > > Andreas > > Am Fr., 3. Apr. 2020 um 11:03 Uhr schrieb Andreas Schultz via lists.fd.io > <http://lists.fd.io> <andreas.schultz=travelping....@lists.fd.io > <mailto:travelping....@lists.fd.io> >: > > > Hi again, > > forget my first description of the problem. After using a VPP node > handoff PCAP trace I've discovered that ARP answers are only send on the > correct interface. > > Or at least VPP tries. The node trace shows that VPP tries to send > the ARP answer (it hits host-ens224-tx), but the packet is not seen by a > tcpdump/dumpcap on the raw host interface. It seems that somehow the af- > packet interface is screwed. > > Andreas > > Am Fr., 3. Apr. 2020 um 10:46 Uhr schrieb Andreas Schultz via > lists.fd.io <http://lists.fd.io> > <andreas.schultz=travelping....@lists.fd.io > <mailto:travelping....@lists.fd.io> >: > > > Hi, > > I have two interfaces that are connected to the same layer L2 > network. Both interfaces have IPs from the same /24 IP range, but they are > in different FIBs. > > My problem is now that ARP are answered on the wrong interface > (with the correct MAC). With the attached config a ARP request for > 172.20.16.105 (interface ens224) is answered on interface ens161. > > In itself the answer on the wrong interface would not be a big > problem, but the underlying switch is confused by seeing the MAC address > on the wrong interface. > > I could understand this behavior if both interfaces/IP where > in the same FIB, but they are not! > > It seems to me that the ARP responder node should filter by > src/dst FIB index? Is there an option or setting to enable that? > > Regards, > Andreas > > Config: > > ip table add 1 > ip table add 2 > > create host-interface name ens224 > set interface mac address host-ens224 00:0c:29:46:1f:53 > set interface mtu 1500 host-ens224 > set interface ip table host-ens224 1 > set interface ip address host-ens224 172.20.16.105/24 > <http://172.20.16.105/24> > set interface state host-ens224 up > > create host-interface name ens161 > set interface mac address host-ens161 00:50:56:86:ed:f9 > set interface mtu 1500 host-ens161 > set interface ip table host-ens161 2 > set interface ip address host-ens161 172.20.16.106/24 > <http://172.20.16.106/24> > set interface state host-ens161 up > > > > > -- > > > Andreas Schultz > > > > > > -- > > > Andreas Schultz > > -- > > Principal Engineer > > t: +49 391 819099-224 > > > > ------------------------------- enabling your networks ------------- > ---------------- > > Travelping GmbH > Roentgenstraße 13 > 39108 Magdeburg > Germany > > > > t: +49 391 819099-0 > f: +49 391 819099-299 > > e: i...@travelping.com <mailto:i...@travelping.com> > w: https://www.travelping.com/ > > Company registration: Amtsgericht Stendal > Geschaeftsfuehrer: Holger Winkelmann > Reg. No.: HRB 10578 > VAT ID: DE236673780 > > > > > -- > > > Andreas Schultz > > -- > > Principal Engineer > > t: +49 391 819099-224 > > ------------------------------- enabling your networks ------------------- > ---------- > > Travelping GmbH > Roentgenstraße 13 > 39108 Magdeburg > Germany > > > > t: +49 391 819099-0 > f: +49 391 819099-299 > > e: i...@travelping.com <mailto:i...@travelping.com> > w: https://www.travelping.com/ > > Company registration: Amtsgericht Stendal > Geschaeftsfuehrer: Holger Winkelmann > Reg. No.: HRB 10578 > VAT ID: DE236673780
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