Date: Tue, 26 Oct 2010 13:04:18 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Joe Auty <joe@netmusician.org> Cc: freebsd-questions@freebsd.org Subject: Re: IP aliasing and Postfix Message-ID: <20101026180418.GH5644@dan.emsphone.com> In-Reply-To: <4CC71554.4040308@netmusician.org> References: <4CC71554.4040308@netmusician.org>
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In the last episode (Oct 26), Joe Auty said: > Hello, > > I have a few IP aliases setup: > > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> > ether 00:0c:29:79:d5:66 > inet <address1> netmask 0xffffff80 broadcast <broadcast address> > inet <address2> netmask 0xffffff80 broadcast <broadcast address> > inet <address3> netmask 0xffffff80 broadcast <broadcast address> > media: Ethernet autoselect (1000baseT <full-duplex>) > status: active I usually set up aliases with a /32 netmask, which seems to be a hint to the kernel that outgoing packets shouldn't use that IP. I then put the correct netmask on the "primary" ip. -- Dan Nelson dnelson@allantgroup.com
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