We need to figure out what's the best config for an VPN network running on the latest Bell Canada's HSPA cellular Network. Technical folks at Bell tolds us the best MTU to use over their HSPA network is 1476.
Correct me if i'm wrong:
HSPA's ISP recommanded MTU - IPsec payload - GRE payload = what we need to configure on our MSS ajust commands and on the Tunnel Interface.
That would be 1476 (HSPA) - 58 (IPsec) - 24 (GRE) = 1394
On our Ethernet interface facing the HSPA modem: MTU should be 1476
On our Tunnel & MSS-adjust command: 1394
Does it make any sens ?