[GTALUG] 2 networks under ip (iproute2)

[ted leslie]

Not really enough to go on.
If the adsl router/modem is a hub/switch to these two devices, give one of
the devices a 2nd ip on the others
subnet range.
If you have to go via a gateway, make sure the gateway can route/forwarding.
Just use tcpdump or similar on the devices where you can and see where the
issue is, you may even see some
 "who has....."  broadcasts that are not answered.

maybe you had a ifconfig ........ eth0:1  in your other set up.

Post your

ifconfig -a
netstat -rn
arp -an

also have iptables active?

having said all that,
how can you do this:

ip address add 192.168.123.251/29 dev eth0
ip route add default via 192.168.123.254
ip address add 169.254.1.1/16 dev eth0
you are overriding the previous, make it eth0:1

unless ip address add  some how auto assigns the virtual eth0:#?
been a while since i used iproute2.
In a quick google, i do see iproute2 using eth#:# notation.

-tl


On Fri, Feb 27, 2015 at 2:21 AM, Walter Dnes <waltdnes at waltdnes.org> wrote:

>   This is frustrating, because it works for me under ifconfig, but not
> under ip (iproute2).  I have 3 devices in this scenario...
>
> * my desktop PC 192.168.123.251/29
> * an HDHomerun TV tuner that comes up in the 169.254.0.0/16 block
> * the ADSL router/modem at 192.168.123.254/29 to which the PC and the
>   tuner are connected.
>
>   I'm trying to get my desktop PC to talk to the TV tuner using ip.
> What am I doing wrong in the following set of commands?
>
> ip address flush dev eth0
> ip link set eth0 down
> ip link set eth0 up
> ip address add 192.168.123.251/29 dev eth0
> ip route add default via 192.168.123.254
> ip address add 169.254.1.1/16 dev eth0
> ip route delete 169.254.0.0/16 dev eth0
> ip route add 169.254.0.0/16 via 192.168.123.254
> ip address show
> ip route show
>
>   The ouput from the 2 "show" commands is...
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
> default
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>     inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
>        valid_lft forever preferred_lft forever
> 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
> state DOWN group default qlen 1000
>     link/ether 00:1d:09:96:6c:1c brd ff:ff:ff:ff:ff:ff
>     inet 192.168.123.251/29 scope global eth0
>        valid_lft forever preferred_lft forever
>     inet 169.254.1.1/16 scope global eth0
>        valid_lft forever preferred_lft forever
> default via 192.168.123.254 dev eth0
> 127.0.0.0/8 dev lo  scope host
> 169.254.0.0/16 via 192.168.123.254 dev eth0
> 192.168.123.248/29 dev eth0  proto kernel  scope link  src 192.168.123.251
>
> --
> Walter Dnes <waltdnes at waltdnes.org>
> ---
> Talk Mailing List
> talk at gtalug.org
> http://gtalug.org/mailman/listinfo/talk
>
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