Subj : Re: Dual wifi connections in Bookworm
To   : The Natural Philosopher
From : bp@www.zefox.net
Date : Wed Nov 27 2024 17:38:34

The Natural Philosopher <tnp@invalid.invalid> wrote:
>
> Bob.. I dont *know* how linux routing copes with two interfaces to the
> same network.
>
> Ideally it should open either at random, and since they have unique
> source addresses pings should always get back. Nothing outside the
> machine itself knows whether it has two interfaces or is in fact two
> separate machines.
>
> I just know that my gut feeling is not to do that, at all.
> When you have all these interfaces up, what does ifconfig show? and route?

To start with, ifconfig reports
wlan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.18  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::26ee:3368:6e6c:aa6e  prefixlen 64  scopeid 0x20<link>
        ether 24:2f:d0:b9:54:f7  txqueuelen 1000  (Ethernet)
        RX packets 6896208  bytes 8657581257 (8.0 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1647035  bytes 215681086 (205.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
and route reports
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.1.254   0.0.0.0         UG    601    0        0 wlan1
192.168.1.0     0.0.0.0         255.255.255.0   U     601    0        0 wlan1

If I bring up wlan0 (the internal wifi interface then ifconfig reports
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.11  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::98a0:b51e:4f4:236a  prefixlen 64  scopeid 0x20<link>
        ether 2c:cf:67:0f:10:64  txqueuelen 1000  (Ethernet)
        RX packets 108  bytes 15818 (15.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1120  bytes 200215 (195.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.18  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::26ee:3368:6e6c:aa6e  prefixlen 64  scopeid 0x20<link>
        ether 24:2f:d0:b9:54:f7  txqueuelen 1000  (Ethernet)
        RX packets 6897155  bytes 8657817041 (8.0 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1648196  bytes 215824139 (205.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
and route reports
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.1.254   0.0.0.0         UG    601    0        0 wlan1
default         192.168.1.254   0.0.0.0         UG    602    0        0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U     601    0        0 wlan1
192.168.1.0     0.0.0.0         255.255.255.0   U     602    0        0 wlan0

At the moment, there's a ping session running to the gateway continuously.
Times are sub-2ms unloaded, until I start loading a big page under chromium,
whereupon ping times go.....dammit, everthing works just fine 8-(

At the moment I'm baffled.

Thanks for writing, apologies for the goose chase.

bob prohaska

--- SoupGate-Win32 v1.05
 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

.