Date: Tue, 29 Jan 2008 09:34:55 +0700 (ICT) From: Olivier Nicole <on@cs.ait.ac.th> To: siraj.shaikh@gmail.com Cc: freebsd-questions@freebsd.org Subject: Re: IP Aliasing Message-ID: <200801290234.m0T2YtLn074403@banyan.cs.ait.ac.th> In-Reply-To: <3b2ddd940801280627m6d747cd1g27682bcd9e50ceb7@mail.gmail.com> (siraj.shaikh@gmail.com) References: <3b2ddd940801280627m6d747cd1g27682bcd9e50ceb7@mail.gmail.com>
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> 1) is there an upper limit to configuring a number of alias addresses? I have a machine with 200+ IP without any problem. > 2) if an interface is configured with an alias address, then what > address is shown on the traffic leaving this interface? So, for > example, if I were to ping this machine on its primary address, I > expect to get a response from the primary address of the interface. > What happens if I ping an alias address, would I get a response from By default exiting traffic is using the primary address (the one defined with no keyword alias in the ifconfig). I think there is a way to choose the exiting IP. When a paket is responding, it use the same IP that was used in the query (else any firewall would be confused in the way). > 3) In the above scenario, all traffic leaving the interface > (regardless of the source IP on it) will have the same MAC address > (the one of the interface) - is that right? Right except maybe some NIC that allow several MAC addresses? That could be used in hi availability? > 4) Does anyone know if there are there any other network > characteristics or behaviour by which we can distinguish a machine > having more than one IP address (primary plus alias) configued on one > of its interface? Once you cross a router, you don't see the MAC of the machine anymore, MAC is local to your LAN anyway. Olivier
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