GL X750 SPITZ Very long tunnel internal routing set-up time

jmansel · 2022-01-19T10:04:26.424Z

Hello

I use the GLX750 as a router between vpn network on the 4G connection (OpenVPN Access Server - 100.96.1.64/28) and local network (192.168.8.0/24).

I configured NO VPN Policy so I have undestood that all network traffic is redirected to the VPN.

I checked the quality of the 4G link, it’s good enough (‘ping www.google.fr’ = env 71ms and is regular without VPN client running and ‘ping ip_vpn_server’ = env 60ms too).

On a cold boot of the GLX750, when I send ping from an other VPN client to the remote network 192.168.8.0/24, the answer is really random at the beginning and, without explication, becomes regular as shown below :

PING 192.168.8.20 (192.168.8.20) 56(84) bytes of data.
From 192.168.8.20 icmp_seq=19 Destination Net Unreachable
From 192.168.8.20 icmp_seq=20 Destination Net Unreachable
From 192.168.8.20 icmp_seq=21 Destination Net Unreachable
From 192.168.8.20 icmp_seq=22 Destination Net Unreachable
From 192.168.8.20 icmp_seq=23 Destination Net Unreachable
64 bytes from 192.168.8.20: icmp_seq=109 ttl=125 time=674 ms
64 bytes from 192.168.8.20: icmp_seq=110 ttl=125 time=197 ms
64 bytes from 192.168.8.20: icmp_seq=111 ttl=125 time=526 ms
From 192.168.8.20 icmp_seq=191 Destination Net Unreachable
From 192.168.8.20 icmp_seq=192 Destination Net Unreachable
From 192.168.8.20 icmp_seq=193 Destination Net Unreachable
From 192.168.8.20 icmp_seq=194 Destination Net Unreachable
From 192.168.8.20 icmp_seq=195 Destination Net Unreachable
64 bytes from 192.168.8.20: icmp_seq=237 ttl=126 time=71.9 ms
64 bytes from 192.168.8.20: icmp_seq=238 ttl=126 time=71.1 ms
From 192.168.8.20 icmp_seq=318 Destination Net Unreachable
From 192.168.8.20 icmp_seq=319 Destination Net Unreachable
From 192.168.8.20 icmp_seq=320 Destination Net Unreachable
From 192.168.8.20 icmp_seq=321 Destination Net Unreachable
From 192.168.8.20 icmp_seq=322 Destination Net Unreachable
64 bytes from 192.168.8.20: icmp_seq=363 ttl=125 time=92.0 ms
64 bytes from 192.168.8.20: icmp_seq=364 ttl=125 time=90.1 ms
From 192.168.8.20 icmp_seq=443 Destination Net Unreachable
From 192.168.8.20 icmp_seq=444 Destination Net Unreachable
From 192.168.8.20 icmp_seq=445 Destination Net Unreachable
From 192.168.8.20 icmp_seq=446 Destination Net Unreachable
From 192.168.8.20 icmp_seq=447 Destination Net Unreachable
64 bytes from 192.168.8.20: icmp_seq=489 ttl=125 time=450 ms
64 bytes from 192.168.8.20: icmp_seq=490 ttl=125 time=4675 ms
64 bytes from 192.168.8.20: icmp_seq=491 ttl=125 time=3661 ms
64 bytes from 192.168.8.20: icmp_seq=492 ttl=125 time=2637 ms
64 bytes from 192.168.8.20: icmp_seq=493 ttl=125 time=1613 ms
64 bytes from 192.168.8.20: icmp_seq=494 ttl=125 time=589 ms
64 bytes from 192.168.8.20: icmp_seq=495 ttl=125 time=92.6 ms
64 bytes from 192.168.8.20: icmp_seq=496 ttl=125 time=115 ms
64 bytes from 192.168.8.20: icmp_seq=497 ttl=125 time=316 ms
64 bytes from 192.168.8.20: icmp_seq=498 ttl=125 time=160 ms
64 bytes from 192.168.8.20: icmp_seq=499 ttl=125 time=489 ms
64 bytes from 192.168.8.20: icmp_seq=500 ttl=125 time=204 ms
64 bytes from 192.168.8.20: icmp_seq=501 ttl=125 time=101 ms

It seems that internal routes of the GLX750 are very very long to establish (many minutes, almost 10mn). Has anybody the same problem ? Any solution idea ?
Thank you in advance !

JM

alzhao · 2022-01-22T06:07:13.144Z

Do you use 192.168.8.1/24 subnet for both ends?

Does your oepnvpn server router this?

I’d avoid to use the same subnet across different subnets.