Question on Routing

Hi All,

I have a question on my routing table. I recently reinstalled, and my
routing table changed. Please look at this:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.1.0 * 255.255.255.0 U 0 0 0
eth0
169.254.0.0 * 255.255.0.0 U 0 0 0
eth0
127.0.0.0 * 255.0.0.0 U 0 0 0
lo
default 192.168.1.1 0.0.0.0 UG 0 0 0
eth0


I do not recognize the IP 169.254.0.0. Where is that coming from? It
goes nowhere??

Please help.....

Arthur

ame...@iwc.net wrote:
> I do not recognize the IP 169.254.0.0. Where is that coming from? It
> goes nowhere??

Now that's queer. My installation complains about a route to
169.254.0.0 at bootup having something wrong with it. I've not
investigated. perhaps I should check out a rootkit or something.

> Hi All,
>
> I have a question on my routing table. I recently reinstalled, and my
> routing table changed. Please look at this:
>
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> 192.168.1.0 * 255.255.255.0 U 0 0 0
> eth0
> 169.254.0.0 * 255.255.0.0 U 0 0 0
> eth0
> 127.0.0.0 * 255.0.0.0 U 0 0 0
> lo
> default 192.168.1.1 0.0.0.0 UG 0 0 0
> eth0
>
>
> I do not recognize the IP 169.254.0.0. Where is that coming from? It
> goes nowhere??
>
> Please help.....
>
> Arthur

Hi,

http://en.wikipedia.org/wiki/Zeroconf may be Your friend.

greetings,
ruediger

On 2005-09-05, (E-Mail Removed) <(E-Mail Removed)> wrote:
> 169.254.0.0 * 255.255.0.0 U 0 0 0
> I do not recognize the IP 169.254.0.0. Where is that coming from?

Say hallo to "zero management networking". The idea is that your machine
pick an IP at random in that subnet, so if you don't have a fixed IP or
a DHCP server and you have a bunch of machines, all of them have a
network without having to configure it. First seen on Windows.

I guess that you have something in your /etc/init.d/network script
to enable it. So look in there if you want to turn it off.

Davide

--
You've got the brain of a four-year-old boy, and I'll bet he was
glad to get rid of it.
-- Julius Henry "Groucho" Marx (http://en.wikiquote.org/wiki/Groucho_Marx)

In article <(E-Mail Removed) >, Davide Bianchi wrote:
> On 2005-09-05, (E-Mail Removed) <(E-Mail Removed)> wrote:
>> 169.254.0.0 * 255.255.0.0 U 0 0 0
>> I do not recognize the IP 169.254.0.0. Where is that coming from?
>
> Say hallo to "zero management networking". The idea is that your machine
> pick an IP at random in that subnet, so if you don't have a fixed IP or
> a DHCP server and you have a bunch of machines, all of them have a
> network without having to configure it. First seen on Windows.
>
> I guess that you have something in your /etc/init.d/network script
> to enable it. So look in there if you want to turn it off.
>
> Davide
>

For more info.:

http://www.duxcw.com/faq/network/autoip.htm

(Result of a google search - I noticed after reading the OP that a netstat -rn
on my FC4 system also shows this network. A search in /etc revealed a
script, /etc/sysconfig/network-scripts/ifup-eth, that adds this "zeroconf"
route if the conditions are right, which they apparently were on my system.
If you have FC4 (and perhaps earlier) you might want to look at that file;
looks like one way to turn it off is to ensure the env. var NOZEROCONF is
set/exported to a non-empty string before the script is run.)

--
Jim Cochrane; (E-Mail Removed)
[When responding by email, include the term non-spam in the subject line to
get through my spam filter.]

I guess the question is: What should my route look like? I have 1
NIC, and my own route/gateway.........

[root@nitelife mail]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.1.0 * 255.255.255.0 U 0 0 0
eth0
169.254.0.0 * 255.255.0.0 U 0 0 0
eth0
127.0.0.0 * 255.0.0.0 U 0 0 0
lo
default 192.168.1.1 0.0.0.0 UG 0 0 0
eth0


Is that standard???

(E-Mail Removed) wrote:
> I guess the question is: What should my route look like? I have 1
> NIC, and my own route/gateway.........
>
> [root@nitelife mail]# route
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use
> Iface
> 192.168.1.0 * 255.255.255.0 U 0 0 0
> eth0
> 169.254.0.0 * 255.255.0.0 U 0 0 0
> eth0
> 127.0.0.0 * 255.0.0.0 U 0 0 0
> lo
> default 192.168.1.1 0.0.0.0 UG 0 0 0
> eth0
>
>
> Is that standard???
>

I have something very similar on my servers.

I assume 192.168.1.1 is your gateway. In which case - your routing table
looks fine. What it's saying is..

IP addresses in the networks 192.168.1.X and 169.254.X.X can be reached
directly via the "eth0" interface, and without going through a router
(Other posters have commented on the 169.254.X.X question).

IP addresses 127.X.X.X can be reached directly via the "lo" interface -
in other words: they are "local" to the machine.

To reach any other address, go via "eth0" and use 192.168.1.1 as the
gateway.


If you dont want/need the 169.254.X.X route, then add the line
"NOZEROCONF=yes" to /etc/sysconfig/network-scripts/ifcfg-eth0
(if the file exists, that is).


Chris

--
http://www.lowth.com/rope - iptables match-module scripting language.
Control Bittorrent, Gnutella and other high-level protocols.