Re: [gentoo-user] Slighty confused about net connections

covici@××××××××××.com <covici@××××××××××.com> [14-11-29 04:28]:
> meino.cramer@×××.de wrote:
>
> > thegeezer@×××××××××.net <thegeezer@×××××××××.net> [14-11-29 02:56]:
> > > On 2014-11-28 18:35, meino.cramer@×××.de wrote:
> > > >Do I really need two interfaces isb0 and usb1 with different
> > > >subnets here?
> > > >Or do I miss something?
> > >
> > >
> > > howdy,
> > > yes you do.
> > > i.e.
> > > PC has real-eth0="192.168.1.1/24"
> > > PC has usb-eth0="192.168.2.1/24"
> > > PC has usb-eth1="192.168.2.2/24"
> > > sysA has usb-eth0="192.168.2.101/24"
> > > sysB has usb-eth0="192.168.2.102/24"
> > >
> > > from PC you want to ping 192.168.2.101, ok it pings
> > > then you want to ping 192.168.2.102 and you have a cached route for
> > > 192.168.2.0/24 dev usb-eth0
> > > you can get around this using policy routing but that is a bit much for
> > > what you want.
> > > you can always use smaller ranges for example:
> > >
> > > PC usb-eth0="192.168.2.1/25"
> > > PC usb-eth1="192.168.2.129/25"
> > > sysA usb-eth0="192.168.2.101/25"
> > > sysB usb-eth1"192.168.2.254/25"
> > >
> > >
> > Hi James, hi thegeezer
> >
> > I want to summerize here what works, what dont work and what I tried
> > -- sorry I am no natie english speaker and my english is not exact
> > enough for such things...but well...lets see..
> >
> > Current setup
> > PC:
> > usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> >         inet 192.168.10.1  netmask 255.255.255.0  broadcast 192.168.10.255
> >         ether ee:6c:bc:6c:03:79  txqueuelen 1000  (Ethernet)
> >
> > Arietta A:
> > usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> >         inet 192.168.10.10  netmask 255.255.255.0  broadcast 192.168.10.255
> >         inet6 fe80::215:f2ff:fe18:b030  prefixlen 64  scopeid 0x20<link>
> >         ether 00:15:f2:18:b0:30  txqueuelen 1000  (Ethernet)
> >
> > Arietta B:
> > usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> >         inet 192.168.10.11  netmask 255.255.255.0  broadcast 192.168.10.255
> >         inet6 fe80::215:f2ff:fe18:b030  prefixlen 64  scopeid 0x20<link>
> >         ether 00:15:f2:18:b0:31  txqueuelen 1000  (Ethernet)
> >
> >
> > Tried:
> > (I only have one PC...)
> > Only Arietta A connected to PC: Works fine -- ssh login ok
> > Only Arietta B connected to PC: Works fine -- ssh login ok
> >
> > Arietta A connected to PC, after it has booted Arietta B connected
> > to the same (motherboard internal) usb-hub of the PC: Cant ssh to Arietta B but
> > can ssh to Arietta A.
> > Switch result if connecting done in opposite order.
> >
> > Question:
> > Is one usb_0 interface on the PC enough?
> > Is there something else wrong with my setup?
>
> You can't have the same ethernet card connected to two different things
> -- you have the same  ethernet address on both boards, so the poor
> thing can only do the first one, you need another interface with a
> different ethernet address.
>
> --
> Your life is like a penny.  You're going to lose it.  The question is:
> How do
> you spend it?
>
>          John Covici
>          covici@××××××××××.com
>

Hi John,


After your email I read the output of dmesg more precisely ... and now
knowing (due to your post :) what to look for and found that
the detection of another usb-ethernet-device attached to my PC created
another usb<n> (first: usb0, second: usb1).

I put the first Arietta into the net 192.168.10.x and the second
Arietta into net 192.168.11.x and do two different ifconfig for usb0
and the other one for usb1 and TADA! - I could ssh into both!

This is not THAT elegant (wasting a complete subnet), but it proofes,
that both boards are /relly/ ok...

This becomes especially important for me since I had soldered three 
"""PCB connectors""" (<<--- this is bloody typical "german English"...
hopefully netherless at least half understandable) to both boards...
and soldering such tiny things on very limited space is not what I
do like most... ;)

So nothing is damaged, and I am happy...until the next
"""challange""".

Thanks a lot for your help!!!

Best regards,
Meino