On Sat, 2025-03-01 at 23:22 +0100, Patrick Dupre via users wrote:
> I had a configuration with was working, but my usb WiFi doogle does
> not work anymore.
Replacing it isn't an option?
As for the best way forward... It might be worth letting us know if
you were using a mix of cabled ethernet and WiFi because that's what
you want to do, or just because you managed to get things working that
way before.
The simplest solution for a small LAN is usually some kind of router
with WiFi connected to your internet service, and everything connected
to that in whatever way's convenient (cabled or WiFi). Often it is the
device that connects to your internet, or it might sit after it.
ISP
|
router
/ \
PC PC (cabled or wireless connections)
> 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).
Sharing a connection *should* set up what you need for that PC to act
as your router.
That DHCP setting expects some DHCP server on your LAN to configure
that interface for you. If you don't have one, then use manual
configuration of your network settings. For what you're doing, with
just three devices, manual setting is probably easier to manage (on
every device, set the interfaces you're using with the IPs you want).
You seem to have:
WiFi mobile
192.168.43.1
|
|
192.168.43.115
PC B (acting as a gateway)
10.42.0.1
|
|
10.42.0.5
PC A
PC A will need to have PC B (10.42.0.1) configured as its gateway
address.
And PC B will need to have the WiFi mobile (192.168.43.1) as its
gateway address for the 192.168.43.115 interface. "Sharing" out its
10.42.0.1 interface ought to set up internal networking properly.
This is where things get confusing... On some PC systems you would be
sharing the internet connection (turning PC B into a router between the
192.168/16 and 10.42/16 networks). On others sharing seems to define
which interface faces the LAN.
I used to do this around 20 years ago with dial-up internet (like the
above sketch, but with a public IP on the outside face of B). This was
pre-NetworkManager days, and I used a script to set up my networking,
setting up a IP forwarding flag and firewall rules.
As for pinging between A & B not working... Firewall rules? Cross-
over ethernet cable (I know they're *rarely* required these days).
> 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
>
>
> For now all my tests to connect to PC C failed.
>
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