02.12.23, 14:27 +0100, fed...@eyal.emu.id.au:

> I did not do any change to the firewall, which is probably the only place
> I could break things (like dropping ICMP).
> The modem has a feature "IPv4 SPI Firewall" and turning it off did not
> help here.

Well, I'm out of ideas, then.

> Anyway, if icmp if dropped then I expect simple pings will not get
> though either, right?

Not necessarily. A packet filter might let one type of ICMP packets
through while blocking other ICMP types/codes.
But you can simply try if pings get through.

What you could also do is make a recording of network traffic when
trying to transmit files with a high MTU setting and look if you find
any ICMP type 3 code 4 packets in there.

-- 
Regards
  mks
--
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