proxmox host becomes inaccessible for two-three minutes at a time

[rakali]

Hello, I have been using proxmox at home for a few years, and this is starting to bug me.

I have noticed disconnects from ssh over time and I just started to notice a broader pattern that lead me to realise that my proxmox host becomes unresponsive to network traffic for about two-three minutes at a time and then it comes back as if nothing happened.

Proxmox and desktop are connected via a gigabit tp-link dumb switch.

During these minutes, my VMs and LXCs are all performing normally and respond to network traffic, etc.

I have been running a very crude network monitoring of

ping 10.0.0.2 | xargs -L 1 -I '{}' date '+%+: {}' > ping.log

With the timestamp I have been trying to go through logs and look for something but so far nothing jumped out at me.

Any help identifying logs to check, troubleshooting and diagnosing this would be appreciated! Thanks!

# pveversion
pve-manager/7.2-7/d0dd0e85 (running kernel: 5.13.19-6-pve)

# pveperf
CPU BOGOMIPS:      33599.10
REGEX/SECOND:      3942942
HD SIZE:           899.19 GB (rpool/ROOT/pve-1)
FSYNCS/SECOND:     1077.89
DNS EXT:           75.54 ms
DNS INT:           0.80 ms (spacelab)

Machine is an intel 8400 cpu with 32GB of RAM.

top - 15:56:04 up 126 days,  5:44, 11 users,  load average: 1.24, 1.26, 1.20
Tasks: 1094 total,   2 running, 1092 sleeping,   0 stopped,   0 zombie
%Cpu(s):  8.1 us,  1.1 sy,  0.0 ni, 85.8 id,  4.8 wa,  0.0 hi,  0.1 si,  0.0 st
MiB Mem :  31770.5 total,   8514.5 free,  22057.6 used,   1198.5 buff/cache
MiB Swap:   4096.0 total,    105.8 free,   3990.2 used.   8851.4 avail Mem

root@menhir:/var/log# free -h
               total        used        free      shared  buff/cache   available
Mem:            31Gi        21Gi       8.7Gi       435Mi       1.1Gi       8.9Gi
Swap:          4.0Gi       3.9Gi       101Mi

# swapon -s
Filename                Type        Size    Used    Priority
/dev/zram0                                 partition    4194300    4086444    10

 

[mira]

Check your network for any IP or MAC address conflict.
This sounds like either your IP is used somewhere else in the network as well, for example by a VM, or there's a duplicate MAC address somewhere.

 

[rakali]

Ah, interesting. So I looked in the ARPtable of my pfsense and I do have duplicate mac address that are the Virtual IPs for pfsense. None others listed there.

Looking at ìp link` on my proxmox the mac address of the proxmox interface is repeated like this. Are they problematic?

2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
    link/ether MA:CA:DDR brd ff:ff:ff:ff:ff:ff
3: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr1 state UP group default qlen 1000
    link/ether MA:CA:DDR brd ff:ff:ff:ff:ff:ff
    altname enp0s31f6
4: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether MA:CA:DDR brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.2/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 XYXY/64 scope link dadfailed tentative
       valid_lft forever preferred_lft forever
5: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether MA:CA:DDR brd ff:ff:ff:ff:ff:ff
    inet6 XYXY/64 scope link
       valid_lft forever preferred_lft forever
111: enp2s0.777@enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0v777 state UP group default qlen 1000
    link/ether MA:CA:DDR brd ff:ff:ff:ff:ff:ff