Problem with MTU?

[sptvar]

Hi

I have a linux server with Openvpn

And I have clients using Openvpn on mobile phones.

When connected via GSM operator - everything works well.

When connected via Wifi - there are problems with opening certain resources (for example, Instagram)
WiFi router connected to the Internet via PPTP (mtu 1400)

I tried different combinations of fragment , mssfix , tun-mtu, link-mtu options - but didn't find a working option.

I think the problem is with packet fragmentation. How to solve it correctly?

[zxun]

how about these (you can shrink it further to 1350 or 1300)

Code: Select all

tun-mtu 1400
txqueuelen 1000
fragment 0
mssfix 0