3 ms·
That works fine for locally generated traffic which has knowledge of the routes. For hosts going through a router, they have no idea what the outbound link MTU
by r1ch 5y ago
That works fine for locally generated traffic which has knowledge of the routes. For hosts going through a router, they have no idea what the outbound link MTU is, requiring PMTU discovery or messing with TCP MSS.
- toast0 5y agoThe claim I replied to was that you couldn't run one MTU for some routes and one for other routes. You absolutely can. But running your default route at 9000 is ill-advised as you mention. If your datacenter routes aren't simply rfc1918 addresses, it would be harder to set the end host routes, and the effort to get larger packets on the wire might not be worth the rather small benefits.