topic Re: ifalias question in Operating System - HP-UX

ifalias question

Dermot Beirne — Wed, 02 Oct 2002 09:47:25 GMT

Hi,
I need to change the IP address of my K class server running 10.20.
However, it currently has a registered address and one customer will not route to the new private address I want to give it.
I am intending to use ifalias to give it back it's registered address after the changover, so this customer can continue to use it.
However, when they ftp to this address, will the server reply using it's new private address, or the alias address?

If not, can i make it appear to reply with it's alias registered address just for this customer. I know NAT is an option, but my timeline is very tight and I won't have NAT ready in time. I'm hoping I don't need it.

Thanks,
Dermot

Re: ifalias question

melvyn burnard — Wed, 02 Oct 2002 10:12:24 GMT

I believe you will find it will respond with it's static or fixed address.

I am not sure whether you wil be able to get it to reply with the aliased address, but there may be a way using an aliased host name in etc hosts?

Re: ifalias question

harry d brown jr — Wed, 02 Oct 2002 10:13:25 GMT

Tell the customer to suck it up!

Actually tell them that you need to change the IP because hackers were using the IP to hide their criminal activity, and that the government has asked for your cooperation.

live free or die
harry

Re: ifalias question

Dermot Beirne — Wed, 02 Oct 2002 12:11:13 GMT

Thanks for the suggestion!
I wish it was that simple.
I guess I'll have to investigate the NAT method.

Regards,
Dermot

Re: ifalias question

Jim Keeble — Thu, 03 Oct 2002 10:41:04 GMT

Hi Dermot,

I tried an experiment here using a 10.20 machine with an ifalias'd address.

I took a nettl trace of an FTP session from a client to the ftp server's ifalias'd address.

Even though the server initiates the data connection, (the one that uses the ftp-data port, ie., tcp port 20), it used the alias'd IP as the source for the ftp-data connection.

Based on this, as long as your router can handle the alias'd IP, you should be ok.

Re: ifalias question

Ravi_8 — Thu, 03 Oct 2002 11:01:05 GMT

Hi, Dermot

You can't do ftp or telnet to the aliased address.

Re: ifalias question

Ravi_8 — Thu, 03 Oct 2002 11:01:16 GMT

Hi, Dermot

You can't do ftp/telnet to the aliased address.

Re: ifalias question

Dermot Beirne — Thu, 03 Oct 2002 11:25:28 GMT

Ravi,
I have another 10.20 server with an aliased IP address, and I have not problem telneting for FTPing to it.

Jim,
If what you say is right (i'm testing it now) then you're getting 10 points for sure!!

Thanks for that
Dermot.

Re: ifalias question

Dermot Beirne — Thu, 03 Oct 2002 11:29:58 GMT

Ravi,

Let me try that again! I have another 10.20 server with an aliased IP address, and I have no problem telneting or FTPing to it.
I'll type a bit slower next time!
Dermot

Re: ifalias question

Ravi_8 — Thu, 03 Oct 2002 11:56:48 GMT

Dermot

You can have 2 IP for the same interface(lan0 and lan0:1 if the interface is lan0). In this case you can use any of the IP assign to lan0/lan0:1. it works fine. But using aliased address wouldn't work ( doubt it). anyway you are testing. let us know the result.