Huawei b260a gsm modem not forwarding gre for pptp tunnel

Posted by Priit on Server Fault See other posts from Server Fault or by Priit
Published on 2011-05-08T01:11:50Z Indexed on 2012/07/10 21:18 UTC
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networking

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vpn

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pptp

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gre

I have a huawei gsm modem that does not want to let gre through. The goal is to connect into a pptp server thats behind the huawei.

In the modems port forwarding settings theres a ready made profile for pptp (1723). After activating that the MS pptp test tools show that connection is being initiated but no gre packets make it to the server.

After taking a closer look into the modems iptables rules theres nothing in there about gre. So I tried making gre rules manualy into forward and preroute chains without any success what so ever.

As far as I can tell theres no ip_gre module present on the device is that needed for gre forwarding?

Thats what I'm afraid of that it doesn't support gre in NAT but how would I turn it into a bridge? The wan interface is ppp0 so bridging it with eth0 would not work right?

Is there some iptables rule I could use to make the modem let all the traffic just straight through?

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