Using a PPTP tunnel as the default gateway

[TheWiFiGuy]

Hi

Hope someone can help me overcome this strange problem I am having.

We have some (500) RB’s with 3G cards in. We create a PPTP tunnel back to our core routers and set it as the default gateway.

The 3G units have a wifi card, and run hotspot services.

However, we have major problems with the traffic destined for our hosted login pages passing up the PPTP link and it runs really slow. If we disable the PPTP tunnel and use the 3G gateway, its fine.

Its not bandwidth issue, is more of a routing, MTU, MSS sort of issue but im stumped. I know its not bandwidth, as 1) we have 2x 1gb feeds on the core router, and 2) if a set a pptp client on my laptop and browse via the vpn link its fine.

anyone have any ideas?

[jandafields]

@TheWiFiGuy

Hi

Hope someone can help me overcome this strange problem I am having.

We have some (500) RB’s with 3G cards in. We create a PPTP tunnel back to our core routers and set it as the default gateway.

The 3G units have a wifi card, and run hotspot services.

However, we have major problems with the traffic destined for our hosted login pages passing up the PPTP link and it runs really slow. If we disable the PPTP tunnel and use the 3G gateway, its fine.

Its not bandwidth issue, is more of a routing, MTU, MSS sort of issue but im stumped. I know its not bandwidth, as 1) we have 2x 1gb feeds on the core router, and 2) if a set a pptp client on my laptop and browse via the vpn link its fine.

anyone have any ideas?

MTU issue???

[CelticComms]

I sounds like it might be MTU related in which case the problem may also be noticeable on some external web sites. Have you tested the effective MTU over the 3G connection and then via the PPTP tunnel?

[bysard]

@TheWiFiGuy

Hi

Hope someone can help me overcome this strange problem I am having.

We have some (500) RB’s with 3G cards in. We create a PPTP tunnel back to our core routers and set it as the default gateway.

The 3G units have a wifi card, and run hotspot services.

However, we have major problems with the traffic destined for our hosted login pages passing up the PPTP link and it runs really slow. If we disable the PPTP tunnel and use the 3G gateway, its fine.

Its not bandwidth issue, is more of a routing, MTU, MSS sort of issue but im stumped. I know its not bandwidth, as 1) we have 2x 1gb feeds on the core router, and 2) if a set a pptp client on my laptop and browse via the vpn link its fine.

anyone have any ideas?

Two things:

1. PPTP or any other VPN on Mikrotik over 2g/3g is horrible with just a little lower mobile signal (we have 200+ locations (RB411xx) on 3g signal and almost all of them are constantly dropping links and reconnecting and there is only 1 lost ping per 500. Our mobile signal range is from -60dBi to -85dBi), so it’s a strong signal everywhere). And like you said… Windows has no problem what-so-ever with VPN connections on the same links, no link drops at all!

2. Your post subject says “Using a PPTP tunnel as the default gateway”. Are you trying to /ip route add dst-address=0.0.0.0/0 gateway=vpn_endpoint_ip_address? (I hope not:))