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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Dual wifi connections in Bookworm
Date: Thu, 28 Nov 2024 09:09:36 +0000
Organization: A little, after lunch
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On 27/11/2024 17:38, bp@www.zefox.net wrote:
> 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
> 

Well so you have two default routes  and two LAN routes but they have 
the same target value.

That is interesting, but I cant say as to what the effect of that will be.

When Ive tried that here with ethernet and wifi, netmanager always shuts 
don the wifi.

-- 
For in reason, all government without the consent of the governed is the 
very definition of slavery.

Jonathan Swift