Strange issue with nic

[Alessandro 123]

Hi to all
I have a strange issue with a network interface. When traffic is running, all is working properly.
If, for whatever reason, traffic is stopped (the issue is with an interface used for backups, thus traffic is going through only during the night), the interfaces seems to be brought down ("ip" is still showing it as up) and no more traffic can be made.

As workaround, I have to create some traffic from *inside* the VM, in example, by running a ping.
When the interface is "blocked", there is no way to bring that up again from outside, only with traffic coming from the inside.

Any idea ? I have this issue only with the proxmox node. The same network switch is serving multiple servers with no issue at all.

I had the same issue in the past with other servers (XenServer) in other racks/switches and, honestly, i don't remember how I solved this.

 

[wolfgang]

Please send the output of

pveversion -v
lspci -vv
[CODE]

 

[Alessandro 123]

# pveversion -v
proxmox-ve: 5.1-28 (running kernel: 4.13.4-1-pve)
pve-manager: 5.1-36 (running version: 5.1-36/131401db)
pve-kernel-4.13.4-1-pve: 4.13.4-26
pve-kernel-4.13.8-2-pve: 4.13.8-28
libpve-http-server-perl: 2.0-6
lvm2: 2.02.168-pve6
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-15
qemu-server: 5.0-17
pve-firmware: 2.0-3
libpve-common-perl: 5.0-20
libpve-guest-common-perl: 2.0-13
libpve-access-control: 5.0-7
libpve-storage-perl: 5.0-16
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-2
pve-docs: 5.1-12
pve-qemu-kvm: 2.9.1-2
pve-container: 2.0-17
pve-firewall: 3.0-3
pve-ha-manager: 2.0-3
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.1.0-2
lxcfs: 2.0.7-pve4
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1
zfsutils-linux: 0.7.3-pve1~bpo9

lspci output is too long to be posted here. I've created a pastbin: https://pastebin.com/raw/2hGbdtcN

 

[wolfgang]

Please upgrade to the current kernel, in your kernel version a known network problems.

 

[Alessandro 123]

Updated right now.
Let's see if this fix the issue

 

[Alessandro 123]

No, it isn't fixed. I still have to ping from "inside"

 

[Alessandro 123]

Bump

 

[wolfgang]

I can't reproduce it here.
I used the same Intel 350 NIC.
There are any special software running on this VM?