Why am I plagued with odd route behaviour?
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 172.16.0.4 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 172.16.0.4 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 172.16.0.4 0.0.0.0 UG 1 0 0 eth0
Firstly, where does 169.254.0.0 come from? I never asked it to be
there!! I found this line in /etc/sysconfig/network-scripts/ifup at
line 343:
# Add Zeroconf route.
if [ -z "${NOZEROCONF}" -a "${ISALIAS}" = "no" ]; then
ip route replace 169.254.0.0/16 dev ${REALDEVICE}
fi
and this one in /etc/sysconfig/network-scripts/network-functions-ipv6 at
line 920:
# test 169.254.0.0/16 (APIPA / DHCP link local)
/bin/ipcalc --network $testipv4addr_globalusable 255.255.0.0 | LC_ALL=C grep -q "NETWORK=169\.254\.0\.0" && return 10
Why are they there and are these the offending lines?
Secondly, why do I have _three_ default routes? (The IP is right) I
set this up with redhat-config-network (including the 10... alias). The
default routes appear every time I do an ifup.
$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:04:76:EB:E9:30
inet addr:172.16.0.52 Bcast:172.16.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4614 errors:0 dropped:0 overruns:0 frame:0
TX packets:4790 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:692940 (676.6 Kb) TX bytes:533527 (521.0 Kb)
Interrupt:11 Base address:0xdc00
eth0:1 Link encap:Ethernet HWaddr 00:04:76:EB:E9:30
inet addr:10.1.0.52 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4614 errors:0 dropped:0 overruns:0 frame:0
TX packets:4790 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:692940 (676.6 Kb) TX bytes:533527 (521.0 Kb)
Interrupt:11 Base address:0xdc00
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:33629 errors:0 dropped:0 overruns:0 frame:0
TX packets:33629 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2317519 (2.2 Mb) TX bytes:2317519 (2.2 Mb)
Thanks for your help,
--
Iain Buchanan <iain@xxxxxxxxxxxx>
It destroys one's nerves to be amiable every day to the same human
being.
-- Benjamin Disraeli
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