[j-nsp] GRE Tunnel bet JUNIPER and CISCO

[masood at nexlinx.net.pk]

Generally, this issue is related to MTU and fragmentation. If you have a
problem with loading web-pages and slow tcp response, you better try
adjusting tcp-mss settings on your cisco router. You can use the following
command under tunnel interface, most of the time it works for me :)

interface tunnelX
ip tcp adjust-mss 1436


On juniper side you can add the following knobs under the gr interface conf


gr-x/x/x {
unit x {
  clear-dont-fragment-bit
  reassemble-packets
  tunnel {
      path-mtu-discovery

Thanks

BR//
Masood


> 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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