Help with eth0:avahi
 

What is eth0:avahi that appears under ifconfig? If eth0 (wireless) is
active, I never see an eth0:avahi. If I am using eth1, which is a wired
connection, eth0:avahi appears (see below). Is avahi only interested in
wireless resources? I do not know what the address 169.254.8.41 refers
to. I though the inet address were address of my machine on my network.


I find this all a bit confusing.

Thanks
don

ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:ce:1f:46:cd
inet6 addr: fe80::216:ceff:fe1f:46cd/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2060 errors:0 dropped:0 overruns:0 frame:13405
TX packets:1972 errors:1418 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1960325 (1.9 MB) TX bytes:448603 (448.6 KB)
Interrupt:17 Base address:0xc000

eth1 Link encap:Ethernet HWaddr 00:1c:23:a5:c7:e6
inet addr:192.168.7.65 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::21c:23ff:fea5:c7e6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:94529 errors:0 dropped:0 overruns:0 frame:0
TX packets:38785 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:59123326 (59.1 MB) TX bytes:5098817 (5.0 MB)
Interrupt:21

eth0:avahi Link encap:Ethernet HWaddr 00:16:ce:1f:46:cd
inet addr:169.254.8.41 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:17 Base address:0xc000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:407 errors:0 dropped:0 overruns:0 frame:0
TX packets:407 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:37442 (37.4 KB) TX bytes:37442 (37.4 KB)

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Help with eth0:avahi
 

On 07/22/2011 02:29 PM, don fisher wrote:
> What is eth0:avahi that appears under ifconfig? If eth0 (wireless) is
> active, I never see an eth0:avahi. If I am using eth1, which is a wired
> connection, eth0:avahi appears (see below). Is avahi only interested in
> wireless resources? I do not know what the address 169.254.8.41 refers
> to. I though the inet address were address of my machine on my network.
>
> I find this all a bit confusing.

According to IANA:
"Autoconfiguration" IP Addresses:

169.254.0.0 - 169.254.255.255

Addresses in the range 169.254.0.0 to 169.254.255.255 are used
automatically by some PCs and Macs when they are configured to use IP,
do not have a static IP Address assigned, and are unable to obtain an IP
address using DHCP.

This traffic is intended to be confined to the local network, so the
administrator of the local network should look for misconfigured hosts.
Some ISPs inadvertently also permit this traffic, so you may also want
to contact your ISP. This is documented in RFC 5735.

> ifconfig
> eth0 Link encap:Ethernet HWaddr 00:16:ce:1f:46:cd
> inet6 addr: fe80::216:ceff:fe1f:46cd/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:2060 errors:0 dropped:0 overruns:0 frame:13405
> TX packets:1972 errors:1418 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:1960325 (1.9 MB) TX bytes:448603 (448.6 KB)
> Interrupt:17 Base address:0xc000

Unless you are on an IPv6 only network this could be why Avahi is
showing up for /only/ eth0, it is/was a second attempt to get an IPv4
address after DHCP failed. I'm also noticing quite a few problems with
this connection as well. So I'm also wondering if you might be
experiencing some problems with a past /thought/ to have been fixed
Avahi bug[1]? Try doing:

apt-get --purge install avahi-autoipd --reinstall
Reinstalling has fixed those problems for other people in the past.

[1]: https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/78078


> eth1 Link encap:Ethernet HWaddr 00:1c:23:a5:c7:e6
> inet addr:192.168.7.65 Bcast:192.168.7.255 Mask:255.255.255.0
> inet6 addr: fe80::21c:23ff:fea5:c7e6/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:94529 errors:0 dropped:0 overruns:0 frame:0
> TX packets:38785 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:59123326 (59.1 MB) TX bytes:5098817 (5.0 MB)
> Interrupt:21
>
> eth0:avahi Link encap:Ethernet HWaddr 00:16:ce:1f:46:cd
> inet addr:169.254.8.41 Bcast:169.254.255.255 Mask:255.255.0.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> Interrupt:17 Base address:0xc000
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:407 errors:0 dropped:0 overruns:0 frame:0
> TX packets:407 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:37442 (37.4 KB) TX bytes:37442 (37.4 KB)

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