logical IP address

[bond007]

Hi All,

How to configure an logical IP address for a NIC?

Thanks and Regards,

Bond.

[Sivakumar TS · Accepted solution]

Hi Bond,

If you mean IP alias, then use the following

#ifconfig eth0:0 netmask up

Regards,

Siva.

[Sivakumar TS]

Check this url ...

http://www.tldp.org/HOWTO/NET3-4-HOWTO-6.html

Hope this helps,

Sivakumar T S

[bond007]

Hello SIva,

Thank you for the quick information.

Is it possible to configure the alias IP addrss in different Subnet.

With Regards,

Bond

[Alexander Chuzhoy]

The IP of logical adapter must be in the same subnet as the actual adapter's IP.

[Alexander Chuzhoy]

Oh, and by the way to create a permanent logical IP address do the following:
copy the file of adapter (ifcfg-eth0 for example) to ifcfg-eth0:1
edit the new file (i.e. ifcfg-eth0:1).
Change the DEVICE=eth0 to DEVICE=eth0:1
and also change to IPADDR= field so that it'll have the desired address (in the same subnet).

[Senthil Prabu.S_1]

Hi Bond,
Configuring logical IP basically defined by your hardware.

So, what is your hardware. And also IP alias is the one used to configure logical IPs.

HTH
Prabu.S

[Senthil Prabu.S_1]

Hi again,
Answering your second question, configuring IP alais address in different subnet is possible.


Refer this link to configure it;
http://www.opendarwin.org/en/articles/network_config/ar01s03.html


HTH,
Prabu.S

[Senthil Prabu.S_1]

Hi,
to configure IP-alias address in different subnet,

step 1:
#ifconfig eth3:1 10.10.22.33 broadcast 10.10.22.255 netmask 255.255.0.0 up

snippet of ifconfig -a output;

eth3 Link encap:Ethernet HWaddr 00:0A:E4:80:2F:F7
inet addr:10.10.3.12 Bcast:10.10.3.255 Mask:255.255.0.0
inet6 addr: fe80::20a:e4ff:fe80:2ff7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2712566 errors:0 dropped:0 overruns:0 frame:0
TX packets:2712547 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:268856055 (256.4 Mb) TX bytes:268831610 (256.3 Mb)
Base address:0x24c0 Memory:dd2c0000-dd2e0000

eth3:1 Link encap:Ethernet HWaddr 00:0A:E4:80:2F:F7
inet addr:10.10.22.33 Bcast:10.10.22.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Base address:0x24c0 Memory:dd2c0000-dd2e0000



HTH,
Prabu.S