SRX Services Gateway
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SRX Services Gateway

Loopback Mtu Problem

‎12-06-2016 10:09 PM

Hello colleagues,

 

I have a problem ,in my case i'm using loopback in my bgp scheme and i configured nat and everything seems like working fine but when i connect  to various web-sites i'have a MTU problem ,how can i solve it ?Default mtu value for loopback is Unlimited,so how can i deal with it ?

 

 

Alex.

3 REPLIES 3
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SRX Services Gateway

Re: Loopback Mtu Problem

‎12-06-2016 10:15 PM
root# set security flow tcp-mss all-tcp mss 1350
root# commit

This will make sure the TCP connections are negotiated with MSS of 1350 irrespective of the higher MTU. You may try lowering the value to 1300 or 1250, if 1350 is not working as expected.
Thanks,
Suraj
Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too
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SRX Services Gateway

Re: Loopback Mtu Problem

‎12-07-2016 03:48 AM

So If I use that command in SRX which is now working in production, can that interrupt current tcp sessions ?

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SRX Services Gateway

Re: Loopback Mtu Problem

‎12-07-2016 06:16 PM
No, MSS exchange happens during TCP 3 way handshake only.
Thanks,
Suraj
Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too