Fortigate 310B -- Sierra Wireless MP70 3G/4G Modem -- Internet -- Fortigate 310B
I am currently experiencing an issue where I am able to ping both sides of the network (public facing IP addresses) but unable to stand up a GRE between the two sites.
[ul]
2.970050 x.x.18.253 -> x.x.2.234 ip-proto-47 68,...
[ul]
Could this be an issue with MTU? both sites are currently set @ MTU 1500. I understand that there are additions to the packet when using GRE/IPsec and PPPoE, and MTU adjustments may need to be made.
Is there any reason why GRE would not work over a 3G/4G PPPoE link, has anyone experienced this before?
I am still working through engineering this, but if anyone has any out of the box ideas that I wouldn't think of exploring; hearing from you would be fantastic!
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What does a MTU path ping discovery show, at the minimum you will need to reduce the MTU by 24+8 bytes for GRE and PPPoE.
I would start with the Path MTU and then make adjustments
Ken Felix
PCNSE
NSE
StrongSwan
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