[j-nsp] GRE Tunnel bet JUNIPER and CISCO

Ben Dale bdale at comlinx.com.au
Wed Nov 3 16:35:21 EDT 2010

As others have mentioned, on the Cisco side you can use ip tcp adjust-mss 1436.  On the Juniper side, I'm not sure how widely the reassmble-packets know is supported across platforms, but the alternative is:

set security flow all-tcp mss 1436

The only downside is that this will adjust MSS on all traffic, not just GRE.



On 03/11/2010, at 11:04 PM, Giuliano Cardozo Medalha wrote:

> People,
> We are trying to close a GRE tunnel between juniper and Cisco routers without success.
> We have tried a lot of MTU configurations but the traffic is suffering a lot ... sometimes slow, sometimes do not open some pages.
> Have you ever configured something like this before ?
> Any tip ou configuration related to best practices ?
> Thanks a lot,
> Giuliano
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