On Sun, May 07, 2023 at 10:31:34AM +0100, David Woodhouse wrote: > > > On 6 May 2023 09:56:35 BST, Hao Chen <ch...@yusur.tech> wrote: > >In the current code, if the maximum MTU supported by the virtio net hardware > >is 9000, the default MTU of the virtio net driver will also be set to 9000. > >When sending packets through "ping -s 5000", if the peer router does not > >support negotiating a path MTU through ICMP packets, the packets will be > >discarded. > > That router is just plain broken, and it's going to break all kinds of > traffic. Hacking the virtio-net MTU is only a partial workaround. > > Surely the correct fix here is to apply percussive education to whatever > idiot thought it was OK to block ICMP. Not to hack the default MTU of one > device to the lowest common denominator.
Yea I don't understand what does path MTU have to do with it. MTU has to be set the same for all endpoints on LAN, that's a fundamental assumption that ethernet makes. Going outside LAN all best are off. -- MST _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
