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I have a plesk 11 setup running centos5 and i'm a little confused by something.

On the server I have 2 ips from 2 different ranges. They are public IP's pingable from the outside world and working fine.

To not give out the IP's lets say they were 192.168.1.2 and 192.168.2.2.

On a normal linux setup you would define the ifcfg:ethX file as including both the ranges gateways and broadcast address to make it work.

On a plesk environment in /etc/sysscripts/network-scripts/ I see 2 files:

File: ifcfg-etho0

DEVICE="eth0"
BOOTPROTO="static"
BROADCAST="192.168.1.255"
DNS1="8.8.8.8"
GATEWAY="129.168.1.1"
HWADDR="XXXXXXXXXXXX"
IPADDR="192.168.1.2"
NETMASK="255.255.255.0"
NM_CONTROLLED="yes"
ONBOOT="yes"

and the second file:

ifcfg-eth0:1

DEVICE="eth0:1"
IPADDR="192.168.2.2"
NETMASK="255.255.255.0"

my question is how is traffic getting to the 192.168.2.2 address, no where can i find gateways or broadcasts from that range and yet it's working absolutely fine - any ideas?

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1 Answer

up vote 0 down vote accepted

I suppose that IP address and subnet mask is enough to determine broadcast and discovery gateway, check this article

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