Public bug reported: We are using neutron rocky, with security driver set to iptables_hybrid, the cluster is deployed on top of a kubernetes cluster. And all the networks are set to mtu 1500
The problem I am facing right now is that ping across compute nodes fails with a packet size larger than mtu. ping -s 2000 172.20.93.171 Surprisingly, if I ping an IP address from the same node, it works without any issue. I have done a simple tcpdump on qvb like (both on remote and local compute node) tcpdump -i qbvxxxx host 172.20.93.171 and icmp And I saw the traffic, but if I am listening on tap or qbr, no traffic is captured. I try to add a log iptable rule to debug, by iptables -t raw -I PREROUTING 1 -m physdev --physdev-in qvb373214e3-8d -p icmp -s 172.20.93.173/12 -j LOG --log-prefix='[netfilter] ' Weird enough, there are no packets counted when packet size set to 2000. ** Affects: neutron Importance: Undecided Status: New -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1893015 Title: ping with large package size fails Status in neutron: New Bug description: We are using neutron rocky, with security driver set to iptables_hybrid, the cluster is deployed on top of a kubernetes cluster. And all the networks are set to mtu 1500 The problem I am facing right now is that ping across compute nodes fails with a packet size larger than mtu. ping -s 2000 172.20.93.171 Surprisingly, if I ping an IP address from the same node, it works without any issue. I have done a simple tcpdump on qvb like (both on remote and local compute node) tcpdump -i qbvxxxx host 172.20.93.171 and icmp And I saw the traffic, but if I am listening on tap or qbr, no traffic is captured. I try to add a log iptable rule to debug, by iptables -t raw -I PREROUTING 1 -m physdev --physdev-in qvb373214e3-8d -p icmp -s 172.20.93.173/12 -j LOG --log-prefix='[netfilter] ' Weird enough, there are no packets counted when packet size set to 2000. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1893015/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp