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zehome / MLVPN

Multi-link VPN (ADSL/SDSL/xDSL/Network aggregation / bonding)
http://www.mlvpn.fr/
BSD 2-Clause "Simplified" License
518 stars 127 forks source link

Cannot connect to some HTTPS sites when using MLVPN #89

Closed fernandonunez closed 7 years ago

fernandonunez commented 7 years ago

Hi! First of all I would like to say thanks for you work on this. I think it is a very interesting solution!

I have implemented a test environment but when I establish the MLVPN session I cannot access some HTTPS sites (as github.com) but I can access some others (like google.com).

When I connect a client to the server and I do not use MLVPN I can access the sites just fine.

Network diagram: image

-Laptop 1 connecting to the internet via MLVPN server using a MLVPN tunnel cannot access github.com (but can ping it) -Laptop2 connecting to the internet via MLVPN server just routing can access github.com

I do not know if you have seen something like that before but it sound weird to me!

Thanks!

zehome commented 7 years ago

I think you have an MTU problem.

You must either adjust the mtu on the tunnel and/or adjust the MSS of TCP packets (using iptables for example)

In your "updown.sh" script, you can use:

/sbin/iptables -A POSTROUTING -t mangle -p tcp --tcp-flags SYN,RST SYN -o $DEVICE -j TCPMSS --set-mss 1350
fernandonunez commented 7 years ago

Thanks so much, that was the case indeed!