This is what I have done.
1) I cannot configure properly manually my interfaces on PC A, ie. enp1s0 and enp2s0
I do not know why.
I tried 10.42.0.1 and 10.42.0.2
Thenk I played with Gateway and DNS.
Hence, I switched to shared to other computer.
it turned to 10.42.0.1 and 10.42.1.1
Then, I can manually set PC B and PC C to 10.42.0.82 and 10.42.1.204
and have the Gateway and the DNS right (10.42.0.1 and 10.42.1.1, DNS 192.168.1.1)
This does not really solve my probleme, because I need to have both interfaces enp1so and enp2s0
set manually to avoid any change.
Anyway.
I set a bridge with nm-cpnnection-editor.
bridge0 in automatic mode
port1 is set enp1s0
and port 2 to enp2s0
ip link show bridge0
16: bridge0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
link/ether 26:a8:27:5e:f2:65 brd ff:ff:ff:ff:ff:ff
tcpdump -i bridge0
dropped privs to tcpdump
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on bridge0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
0 packets captured
0 packets received by filter
0 packets dropped by kernel
but it does not work (port unreacheble)
nm-cpnnection-editor says never
I tried proxu Automatic and None
IPVA4 setting
I tried Automatic (DHCP)
Automatic (DHCP) addresses only
Link-local only
shared to other computer
I do not know how to set up manually!
Any idea ?
>
> On 6/15/25 12:32 PM, Samuel Sieb wrote:
> > On 6/15/25 1:42 AM, Patrick Dupre via users wrote:
> >> PC A is connected to internet and it is fine. device enp0s20f0u11
> >> It is in automatic setting.
> >> This PC has 2 ethernet cards
> >> By default
> >> enp1s0 (connected to PC B) and enp2s0 (connected to PC C)
> >> If I understand PC A run as a router.
> >> By default (shared to other computer) if I start PC B first (after PC
> >> A and before PC C)
> >> enp1s0 takes 10.42.0.1
> >> and
> >> enp2s0 takes 10.42.1.1
> >> PC A in DHCP (automatic) assigns an IP 10.42.0.82
> >> while PC B get 10.42.1.204.
> >>
> >> If I reverse the starting order enp1s0 and enp2s0 addresses are switched.
> >>
> >> It is fine except that PC B and PC C do not communicate together.
> >>
> >> If I understand I need to configure every thing manually to have a
> >> single network
> >> for example
> >> enp1s0 would have 10.42.0.1 PC B could have 10.42.0.82
> >> enp2s0 would have 10.42.0.2, PC C could have 10.42.0.204
> >>
> >> Then, what would be the Gateways ? 10.42.0.x (x=1 and x=2 ?)
> >
> > Now you're getting more complicated. For that you need to create a
> > bridge over both ethernet interfaces, then set the bridge to shared. Set
> > the IP address and subnet. Then set B and C to have a static address in
> > that subnet. The gateway and DNS will be the address of A that you set
> > in the shared interface.
>
> You will need to use nm-connection-editor for this.
>
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