Hi Strahil I get: ping: local error: Message too long, mtu=2044 ping: local error: Message too long, mtu=2044 so ip report is correct and nmcli did not the job ? Patrick Le 14/12/2020 à 20:23, Strahil Nikolov via CentOS a écrit : > what happens when you 'ping -M do -s 65000 -c 4 <other IBoIP system> ? > > Best Regards, > Strahil Nikolov > > > > > > > В понеделник, 14 декември 2020 г., 15:46:50 Гринуич+2, Patrick Bégou <patrick.begou at legi.grenoble-inp.fr> написа: > > > > > > Hi, > > I'm deploying a CentOS8 (not stream 😁) cluster and I have a question > about MTU on the interfaces. I have a connectX6 Mellanox interface where > I need IBoIP setup. > I've setup this interface via nmcli and set the MTU to 65520 with: > > nmcli connection modify ib0 mtu 65520 > nmcli connection up ib0 > > Running "nmcli connection show ib0" report: > > infiniband.mtu: 65520 > > But "ip addr show ib0" report a mtu of 2044: > > 6: ib0: <BROADCAST,MULTICAST,UP,LOWER_UP> *mtu 2044 *qdisc mq state > UP group default qlen 256 > > Why ? Who is wrong (possibly me....)? > > Thanks > > Patrick > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos