![]() ![]() ![]() You can also save a few bytes for GRE/IPSec by changing the default mode from tunnel to transport (or it might be the converse). MSS might not always preclude TCP fragmentation even for TCP sessions that started across it.Įxcept in cases like Jamie mentions, which should be addressed by enabling PMTUD for the tunnel traffic, you can usually go even a little larger, such as 1420, but 1400 is a little "safer". VPN tunnel as an alternate or backup path).Īlso keep in mind, although we normally set MSS adjust for MTU less 40, options can increase the overhead, i.e. ![]() Yes, with MSS adjust, IP MTU shouldn't (generally) matter to TCP traffic unless it's possible that TCP transit traffic's TCP session startup didn't transit the MSS adjusted interface (e.g. In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage. Usage of this posting's information is solely at reader's own risk. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. ![]()
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