Re: Networking Q concerning /etc/network/interfaces
On Sat, Feb 11, 2012 at 2:13 PM, Harry Putnam <reader@newsguy.com> wrote:
>
> I'm getting confused by what I see in /etc/network/interfaces,
> compared to what I see with ifconfig -a.
>
> What I see in /etc/network/interfaces:
>
> auto lo
> iface lo inet loopback
> allow-hotplug eth0
> iface eth0 inet dhcp
>
> Does not match what I see with ifconfig -a
>
> eth0 Link encap:Ethernet HWaddr 00:40:f4:b5:29:41
> inet addr:192.168.1.54 Bcast:192.168.1.255 Mask:255.255.255.0
> BROADCAST MULTICAST MTU:1500 Metric:1
>
> eth1 Link encap:Ethernet HWaddr 00:11:09:ee:6c:04
> inet addr:192.168.1.42 Bcast:192.168.1.255 Mask:255.255.255.0
> inet6 addr: fe80::211:9ff:feee:6c04/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> What shows as eth1 in ifconfig is the working IP (...42) of this host.
> Nothing is plugged into device seen as eth0 (...54). That is,
> although there is a second network adapter, nothing is plugged into
> it, and all traffic comes and goes on [...]42.
>
> It can be seen in the output of netstat -r
>
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window irtt Iface
> default fw.local.lan 0.0.0.0 UG 0 0 0 eth1
> 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1
>
> So it appears at a superficial reckoning that dhcp has assigned an
> address to eth0, but that address appears to be attached to eth1 in
> ifconfig and netstat output.
>
> What explains this apparent anomaly?
I can't explain why eth0 has an Ip address but it isn't "UP".
Is eth1 being brought up by Network Manager?
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