Hi, I'm trying to connect some VMs over EoGRE (using gretap on my side):
ip link add foo type gretap remote <remote> local <local> This works fine for large packets, but the system in the other end drops smaller packets, such as ARP requests and small ICMP pings. After looking at the GRE packets in Wireshark, it turns out the Ethernet packets within the EoGRE packet is undersized (under 60 bytes), and Linux doesn't pad them. I haven't found anything in RFC 7637 that says anything about padding, so I would assume it should conform to the usual Ethernet padding rules, ie., pad to at least ETH_ZLEN. However, nothing in Linux' IP stack seems to actually do this, which means that when the packet is decapsulated in the other end and put on the (potentially virtual) wire, it gets dropped. The other system properly pads its small frames when sending them. Is there a way to get around this, short of looping the packets out through a physical wire to get the padding? Is it simply a bug? I've been testing with 4.19.28, but it doesn't look like git master has any changes in this area. /* Steinar */ -- Homepage: https://www.sesse.net/
