02.12.23, 14:27 +0100, fedora@xxxxxxxxxxxxxx: > 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 -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue