![](https://seccdn.libravatar.org/avatar/ba86f283d614d2cd9b6116140eaddded.jpg?s=120&d=mm&r=g)
On 01/04/2018 02:51 PM, Carlos E. R. wrote:
It's enough to lower the MTU on the uplink device. Yes, but that will cause a 1500 byte packet inside to be divided in two packets when going outside. More work for the router, and slowdown.
With path MTU discovery, the packet size is automatically adjusted to accommodate smaller MTUs. It does this by a router sending a "too big" ICMP message back to the source, with the recommended MTU. Linux appears to use it for all traffic, but Window for TCP only. Of course, with IPv6, PMTUD is mandatory.
The 1472 figure rings a fuzzy bell with old modems. :-?
I remember 576 from the dial up modem days and 1492 for ADSL. I don't ever recall hearing 1472 until now. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org