On Sat, 1 Mar 2025 at 22:22, Patrick Dupre via users < users@lists.fedoraproject.org> wrote:
> I am lost. > > I had a configuration with was working, but my usb WiFi doogle does not > work anymore. > The configuration which was working > > Doogle on PC A with 2 ethernet cards. > One connected to PC B: a laptop > one connected to PC C > > Now, The laptop PC B is connect to a wifi mobile. > It works > wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 192.168.43.115 netmask 255.255.255.0 broadcast > 192.168.43.255 > > I set the ethernet interface "shared to other computers" > enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255 > > Now I am trying to connect this ethernet card to PC A > From the network interface, It tried > "shared to other computers" > and > "Automatic (DHCP)", > but none of them allow me to make the connection > (connecting for ever). > Hence, I tried manually > 10.42.0.5 255.255.255.0 > It connected > enp1s0 flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 > inet 10.42.0.5 netmask 255.255.255.0 broadcast 10.42.0.255 > > But the 2 computers do not talk together > From PC B to PC A: > ping 10.42.0.5 > PING 10.42.0.5 (10.42.0.5) 56(84) bytes of data. > From 10.42.0.1 icmp_seq=1 Destination Host Unreachable > traceroute to 10.42.0.5 (10.42.0.5), 30 hops max, 60 byte packets > 1 Sappho (10.42.0.1) 3068.823 ms !H 3068.691 ms !H 3068.614 ms !H > route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use > Iface > 0.0.0.0 192.168.43.1 0.0.0.0 UG 600 0 0 > wlp2s0 > 10.42.0.0 0.0.0.0 255.255.255.0 U 100 0 0 > enp3s0 > 192.168.43.0 0.0.0.0 255.255.255.0 U 600 0 0 > wlp2s0 > > From PC A to PC B: > same behavior > route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use > Iface > 10.42.0.0 0.0.0.0 255.255.255.0 U 100 0 0 > enpls0 > 192.168.122.0 0.0.0.0 255.255.255.0 U 600 0 0 > virbr0 I think if I'm reading your description correctly, this is roughly your topology and addressing? https://photos.app.goo.gl/sWCqtQNNBBzBuGWk9 If my understanding is correct - the default gateway (0.0.0.0) from PC A (10.42.0.5) needs to be PC B (10.42.0.1) - you probably don't want 192.168.0.122.0 to be a gateway configured on PC A - you probably need ip_forwarding (net.ipv4.ip_forward) enabled on PC B if it's being used as an ersatz router
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