Hi all,
I have been running across a network issue where users will be unable to access any network resources. The basic setup is a router with a LAN interface, an internet link and an IPSEC tunnel built over the internet link to send production traffic.
Few months back, the users started facing issues when no specific MSS was set on the LAN interface. I assume it would have been 1500 at this point. We reduced the tcp-adjust-mss to 1320 on the LAN interface and this fixed the issue.
Couple of days ago, the issue repeated and we reduced the tcp-adjust-mss further from 1320 to 1300 and this resolved the issue.
Could someone please help me with why this issue is happening and why does it get resolved only when we reduce the tcp-adjust-mss on the LAN interface?
Thank you,
Regards,
PJ
