CNAME and IPv6

[Matus UHLAR - fantomas]

>On Tue, May 28, 2024 at 09:09:20PM +0200, Marco Moock wrote:
>> rinetd manages 2 separate connections and should work with PMTUD.

On 28.05.24 22:17, Peter wrote:
>I'm wondering how it would. The connections are TCP, the PMTU works
>via ICMP6.

No, Path MTU discovery works with TCPv4 using ICMPv4 as well.
(although it was/is quite common to block ICMP packets which can make it not 
work properly)

> So I would assume, the ICMP "packet too big" message
>reaches the host where rinetd runs, is swallowed by the kernel, and
>the kernel sets the MTU in it's hostcache. Or something along that
>line.

>The TCP traffic however gets forwarded by rinetd to the internal
>appserver(s) - which never get the message that they should reduce
>their MTU.

The data from one TCP connection are sent through another TCP connection, 
where both connections are separate with separate MTU and PMTUD.

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Windows 2000: 640 MB ought to be enough for anybody