creating IP aliases

[sureshp]

Hi All,
I have a problem in creating an alias address for the existing NIC. I have a NIC en0 and it has the address 53.252.38.40 and I am trying to create a alias address as 53.252.38.50. When I do this step using the ifconfig command somebody reocmmended me to put the netmask as FFFFFFFF instead of the orginal netmask. The actual problem is I couldn't able to ping the alias address from my machine itself. Also anybody have any Idea why we have to use this netmask(FFFFFFFF)??

Thanks
Suresh

 

[gheist]

ping -I 53.252.38.50 53.252.38.50

 

[swtbart]

I don't know where have you heard that but positively you have to put your netmask as usual.
I have an ethernet adapter with 2 aliases in this way
Regards

 

[sureshp]

Hi swbart,
Thanks for the info. Can you please explain the steps you followed to create the alias.

Thanks to all
Suresh

 

[gheist]

ifconfig en9 inet 192.168.0.5 netmask 255.255.255.0
ifconfig en9 inet 192.168.0.50 netmask 255.255.255.0 alias
to remove

ifconfig en9 inet 192.168.0.50 netmask 255.255.255.0 -alias

have a look at smit menus regarding communications application TCP/IP and its advanced config - ie assign an address to adaptor and add ipv4 alias

 

[PSD]

Suresh,

Rather than use ifconfig you should update inet0 and therefore CuAt with the alias, this will ensure that the alias survives a reboot:

smitty inetalias

select your adapter i.e. en0

Add in your address
Add in you subnet mask i.e. 255.255.255.0

Press return.

Look at the alias via ifconfig -a

Try a test ping.

The subnet mask advice you were given was possibly the worst networking tip I have ever read.

Best of luck

PSD
IBM Certified Specialist - AIX V4.3 Systems Support
IBM Certified Specialist - AIX V4 HACMP

 

[Guest_imported]

What is the importancy of IP aliassing.

Can anyone please clarify on this,

Thank you in advance

 

[gheist]

eg a single server hardware can can make appearance of multiple (web)servers

 

[Guest_imported]

I used do to do this in another way by editing the hosts file

ie, ipaddress:0