why lo interface is not in routing table?

montyleesam · 06-10-2008, 12:57 AM

Hello, all.

I have configured loopback interface(127.0.0.1) well without no problem.
But I can't find any related lo interface at routing table like below.

# route -n
192.168.53.0 0.0.0.0 255.255.255.224 U 0 0 0 eth0
0.0.0.0 192.168.53.1 0.0.0.0 UG 0 0 0 eth0

I don't know why lo interface is not seen at routing table?
But it seems to be no problem for service which listened at 127.0.0.1 like spamd.
But I don't know why there would be no problem in spite of without routing table?

Thanks in advance.

jschiwal · 06-10-2008, 01:06 AM

It should be:

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
jesnet          *               255.255.255.128 U     0      0        0 eth2
loopback        *               255.0.0.0       U     0      0        0 lo
default         router          0.0.0.0         UG    0      0        0 eth2

Code:

sudo cat /etc/sysconfig/network/ifcfg-lo
root's password:
# Loopback (lo) configuration
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
BROADCAST=127.255.255.255
STARTMODE=onboot
USERCONTROL=no
FIREWALL=no