[c-nsp] DMVPN/mGRE on L3VPN - anyone experience issues with encapsulation overhead/MTU?

Alex Pressé alex.presse at gmail.com
Wed Oct 9 12:14:04 EDT 2013

I run a similar topology. On the tunnel interfaces I have "ip tcp
adjust-mss 1452" and "tunnel path-mtu-discovery". No problems encountered;
though the traffic profile is basic remote office file and print.

On Wed, Oct 9, 2013 at 9:30 AM, JP Senior <SeniorJ at bennettjones.com> wrote:

> Hey, all.
> I'm looking at an option to consolidate and reduce complexity of a
> multi-provider L3VPN network in a way that lets me also use internet-based
> VPNs for backup.  Right now I have dual provider uplinks at all of my sites
> to provide me inter-office WAN connectivity.
> DMVPN is a nice and easy option where I can have everything run in a
> single routing domain, drasticially simplifying my network topology.
> Has anyone experience with a network running in such a design?  I am
> concerned about increased latency, and worse, packet overhead.  I'm not
> sure I'll be able to get jumbos on these providers, so I'll have to deal
> with ipsec/gre overhead.  I don't do anything crazy blocking with ICMP, but
> I'm still hesitant to move forward with such a design.
> -JP Senior
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Alex Presse
"How much net work could a network work if a network could net work?"

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