DMVPN tunnel on a shelf (ADSL Internet access provider)

Hello world

I wonder if I can potentially use same value of pi and the same mtu size of ip tcp mss on the Tunnel interface and interface Fastethernet WAN on my DMVPN spoke routers? WAN interface is facing an ADSL modem provided by the ISP.

That is something like:

Interface FastEthernet 4

IP 1400 MTU

IP tcp adjust-mss 1360

....

Interface Tunnel0

IP 1400 MTU

IP tcp adjust-mss 1360

Will be this questions with fragmentation for DMVPN?

Thank you!

Yes the major impact is the fragmentation and so performance.

I think what you describe is OK and as mentioned turning tunnel PMTUD will take care of some scenarios.

Think of it like this (this is a simplification, but I think as a fitting one).

A 1400 bytes packat happens LAN, we perform the route search, he points through the tunnel interface. We carry out the audit, ' do we need to fragment this packet? The answer is 'no', because it is part of the MTU.

We perform encapsulation (torn by the characteristics applied on the tunnel interface), adding the GRE + IPsec (header GRE, IPsec header and padding).

Now, we take this encapsulated package and check routing post encapuslation, he'll call back via interface fa4.

Don't the packets in the MTU of 1400 feet. 'No', we must fragmed if it is allowed.

Tags: Cisco Security

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