[j-nsp] Adjusting MSS size for GRE tunnels in JunOS

[Harry Reynolds]

AFAIK, not at this time. The TCP MSS is a system-wide parameter, and
JUNOS software does not support adjustment:

jnpr at foo> start shell 
% sysctl -A | grep mss
net.inet.tcp.mssdflt: 512
net.inet.tcp.v6mssdflt: 1024
net.inet.tcp.send_mssdflt: 0


It is not recommended that folks mess with this type of system default.
I have heard that some folks have found a work-around by increasing GRE
tunnel MTU (say to 1600).

HTHs

  
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Terry Rodery
> Sent: Wednesday, November 30, 2005 1:51 PM
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] Adjusting MSS size for GRE tunnels in JunOS
> 
> Hi,
> 
> I'm curious to know if JunOS on the M-series is capable of 
> doing that same as Cisco's "ip tcp adjust-mss 1436" on a 
> tunnel interface.  I've done a bit of looking around and so 
> far I've only seen it mentioned for JunOS for ERX.  Anyone 
> have any idea or could possible point me in the right direction? :)
> 
> Regards,
> Terry Rodery
> 
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