On Thu, Sep 08, 2022 at 03:42:47AM +1000, Martin D Kealey via Exim-users wrote: > > > > Kai Bojens <k...@artfiles.de> wrote: > > > But, then again there is an explicit virtual interface with that IP on my > > server Host A: > > > > ens3: IPv4 & IPv6 > > ens3:402: 1.2.3.4 (IPv4 only) > > > > I would have that thought that exim then chooses ens3:402 for outgoing > > mail, but it decides to use ens3 and IPv6. Is there any way to change this > > behaviour? > > > > Assuming you're on Linux... > > Linux networking simply doesn't work the way that the ifconfig command was > designed to support, back in the 1980's. Instead the "ifconfig" command is > lies to you when it shows "virtual interfaces". > > Look closely at the output of "ip addr list"; you won't see any virtual > interfaces, because they're not real, and I don't just mean "not hardware". > I mean there is no entity in the kernel that corresponds to what you see as > a virtual interface. > > When Exim asks the Linux kernel for the list of interface names, it gets > given the real interface names. > > I suggest using "ip" rather than "ifconfig" so that you see the true state > of your networking configuration รง > > If you want Exim to bind to a specific address, that's plausible; I don't > know if it already offers that option but if it doesn't it's not a big job > to add it.
For that, see "local_interfaces" at https://www.exim.org/exim-html-current/doc/html/spec_html/ch-starting_the_daemon_and_the_use_of_network_interfaces.html The name says "interfaces" but what it wants is IP addresses and optional ports. The kernel figures out which interfaces to use from the addresses. -- Mark H. Wood Lead Technology Analyst University Library Indiana University - Purdue University Indianapolis 755 W. Michigan Street Indianapolis, IN 46202 317-274-0749 www.ulib.iupui.edu
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