Re: Configuring the same IP on multiple addresses

2007-10-30 Thread Vlad Yasevich
David Miller wrote: From: David Miller [EMAIL PROTECTED] Date: Mon, 29 Oct 2007 15:25:59 -0700 (PDT) Can you guys please just state upfront what virtualization issue is made more difficult by features you want to remove? Sorry, I mentioned virtualization because that's been the largest

Configuring the same IP on multiple addresses

2007-10-29 Thread Vlad Yasevich
Hi All Does anyone have a reason why Linux allows one to configure the same IP or IPv6 address on multiple interfaces? For IPv4, since linux implements a weak host model, assigning duplicate addresses doesn't make any sense, since the addresses really belong to the host and not the interface.

Re: Configuring the same IP on multiple addresses

2007-10-29 Thread David Stevens
[EMAIL PROTECTED] wrote on 10/29/2007 11:03:37 AM: So, I am looking for technical reasons why this is permitted. Vlad, Is there a technical reason to disallow it? Rather than anticipate all the possible uses for a machine, it's, of course, generally better to restrict only the things

Re: Configuring the same IP on multiple addresses

2007-10-29 Thread David Stevens
For v6, there are plenty of operational reasons to not allow this. You really turn unicast into anycast when you do this and there are special rules to be followed. I don't see it that way. The only problem I can think of offhand is that you can't use a multi-interface address to

Re: Configuring the same IP on multiple addresses

2007-10-29 Thread Vlad Yasevich
David Stevens wrote: [EMAIL PROTECTED] wrote on 10/29/2007 11:03:37 AM: So, I am looking for technical reasons why this is permitted. Vlad, Is there a technical reason to disallow it? Rather than anticipate all the possible uses for a machine, it's, of course, generally better to

Re: Configuring the same IP on multiple addresses

2007-10-29 Thread David Miller
From: David Miller [EMAIL PROTECTED] Date: Mon, 29 Oct 2007 15:25:59 -0700 (PDT) Can you guys please just state upfront what virtualization issue is made more difficult by features you want to remove? Sorry, I mentioned virtualization because that's been the largest majority of the cases being

Re: Configuring the same IP on multiple addresses

2007-10-29 Thread Brian Haley
David Miller wrote: From: David Miller [EMAIL PROTECTED] Date: Mon, 29 Oct 2007 15:25:59 -0700 (PDT) Can you guys please just state upfront what virtualization issue is made more difficult by features you want to remove? Sorry, I mentioned virtualization because that's been the largest