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PPTP/PPPoA and Policy Routing, MTU issue?

I have a NIC set as a PPPoA/PPTP tunnel that connect to a PPTP VPN at my ISP (only way to get static IP from them). The MTU on it is 1500, also my WAN is Cable with MTU = 1500
The VPN "works".

To test it out I have setup a Policy Route such as:

Type: Interface route
Source network: my laptop host
Services: Any
Destination network: Internet
Target Interface: PPPoA VPN Interface

This work pretty well for ping, internet download etc, however I noticed two things:

1) Some website partially load or load forever, wireshark show a HTTP GET then a ACK back and nothing else.

2) I sometime see the message: "ICMP Fragmentation Needed"

Any ideas?

Thanks!


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Parents
  • I bet you're right.  Try an MTU of 1478. If that doesn't work, then drop down to 1450 and work up from there.

    Any luck?
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Reply
  • I bet you're right.  Try an MTU of 1478. If that doesn't work, then drop down to 1450 and work up from there.

    Any luck?
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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