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6.4

IP aliasing on 2 subnets

Asked by cygnus in Linux Networking

Tags: ifconfig, interface, using

I'm having some trouble with ip aliasing and hoping someone could help me.
I have read the docs on this.
My network has 2 subnets. A partial class C 206.245.154.64 (ip addresses
206.245.154.65-206.245.154.128) for servers and router. .65 is the router
And a FULL class C 205.147.217.0 for web customers and ppp connections
ip's 1-179 are allocated for ppp, 180-183 right now for customer's web
servers.

AMD complains on boot that "another unused interface was discovered
<aliased_ip>"
and then repeats the message for every ip I have

On the local LAN the aliasing seems to work fine. When I dial-up to the
router though on a ppp connection, i can't get to anything on the
205.147.217 network. Pings just time out. Nothing to them works.

Any help is appreciated. -Tony

This is the way i have the web server (206.245.154.68) w/the aliased web
servers set up.

 ** Under ifcfg-routes I have..

# Configure new sub network for aliases
route add -net 205.147.217.0 netmask 255.255.255.0 eth0
# Configure ip aliases
ifconfig eth0:0 205.147.217.180
ifconfig eth0:1 205.147.217.181
ifconfig eth0:2 205.147.217.182
ifconfig eth0:3 205.147.217.183

# Add static routes to hosts on this network
route add -host 205.147.217.180 eth0:0
route add -host 205.147.217.181 eth0:1
route add -host 205.147.217.182 eth0:2
route add -host 205.147.217.183 eth0:3

** Under route -n it says..

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
205.147.217.180 0.0.0.0         255.255.255.255 UH    0      0        0 eth0:0
205.147.217.181 0.0.0.0         255.255.255.255 UH    0      0        0 eth0:1
205.147.217.182 0.0.0.0         255.255.255.255 UH    0      0        0 eth0:2
205.147.217.183 0.0.0.0         255.255.255.255 UH    0      0        0 eth0:3
206.245.154.64  0.0.0.0         255.255.255.192 U     0      0        2 eth0
205.147.217.0   0.0.0.0         255.255.255.0   U     0      0        0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0    
 0        1 lo
0.0.0.0         206.245.154.65  0.0.0.0         UG    1      0        0 eth0

** ifconfig says..

eth0:0    Link encap:10Mbps Ethernet  HWaddr 00:A0:C9:60:50:0A
          inet addr:205.147.217.180  Bcast:205.147.217.255 Mask:255.255.255.0
          UP RUNNING  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0
          TX packets:0 errors:0 dropped:0 overruns:0
etc..
 
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[+][-]11/28/97 01:08 AM, ID: 1586835Expert Comment

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About this solution

Zone: Linux Networking
Tags: ifconfig, interface, using
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Solution Provided By: unicorntech
Participating Experts: 2
Solution Grade: C
 
 
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