hmm, having issues with a Mellanox NIC under Debian after migrating from OpenSuse.
83:00.0 Ethernet controller: Mellanox Technologies MT27700 Family [ConnectX-4]
ethtool shows the link is up and 40 Gbps, lldpctl show the correct switch at the other end, IP is configured and pings locally, but when I try to reach another IP via that link, it doesn't work.
It seems that arp is not working as it doesn't get a response:
18:20:19.026713 STP 802.1w, Rapid STP, Flags [Proposal, Learn, Forward], bridge-id 8000.1c:34:da:ff:b7:80.8001, length 36
18:20:19.540723 ARP, Request who-has 192.168.41.10 tell 192.168.41.11, length 28
18:20:19.559161 LLDP, length 156: switchv16
Module is loaded:
mlx5_ib 491520 0
ib_uverbs 204800 1 mlx5_ib
mlx5_core 2174976 1 mlx5_ib
ib_core 524288 2 ib_uverbs,mlx5_ib
mlxfw 36864 1 mlx5_core
pci_hyperv_intf 12288 1 mlx5_core
#followerpower #sysadmin #network #debian