1280 might be a little aggressive Too low and things will stop working correctly. PPPoE I assume ? I’d try 1440 or as low as 1400, but no lower. It’s possible to calculate exactly what you should us but as a rough experiment, this should reveal any possible issue. Remember, this was a stab in the dark without packet captures etc to support a theory. — Denis Hancock Chief Technical Officer / Director Mobile 0407 687 621 Book a meeting with me <https://calendly.com/denis-hancock/webmeet> Australian Information Security Association (AISA) Member This email is intended only for the addressed and is subject to copyright. If you have received this email in error, please notify the sender immediately.
On 9 Apr 2022, at 12:15, Karl Auer <kauer@nullarbor.com.au> wrote:
On Fri, 2022-04-08 at 16:44 +1000, Denis Hancock wrote:
Try dropping the MTU on the WAN
I tried dropping the MTU on the WAN by setting max_mtu and max_mru to 1280 on the PPPoE client interface. 1280 because anything less and IPv6 stops working.
Most things continued to work fine but a few things did not:
- The AWS login screens would not load (Console and SSO) - my OpenVPN VPN would not connect - GoogleMail (web interface) would not load
Not sure what I did wrong there, but when I put it back to the value it had before - 1480 - everything worked again.
I'll give it another try later on and disconnect/reconnect all PC network interfaces in case they were "remembering" stuff.
Regards, K.
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