On 2009-08-30 Konrad Rosenbaum <kon...@silmor.de> wrote:
> Package: exim4
> Version: 4.69-9
> Severity: wishlist
> Default installations of exim4 do not include IPv6 addresses, so it does not
> work as expected
> on IPv6 systems. This affects the dc_local_interfaces
> in /etc/exim4/update-exim4.conf.conf:
> for local configurations set it to '::::1:127.0.0.1'
> for all others set it to: '::::0:0.0.0.0'
> (::1 is localhost in IPv6, :: is the any address of IPv6, exim doubles the
> colons)
Hello,
afaict the important part of your bugreport is already solved. The
default value for configurations with a remotely accessible SMTP
listener ("internet") does not set exim's main configuration option
local_interfaces. And this yields
argenau:~$ netstat -tl | grep smtp
tcp 0 0 *:smtp *:* LISTEN
tcp6 0 0 [::]:smtp [::]:* LISTEN
because it is the builtin default value to also listen on IPV6 if
possible.
Quoting spec.txt:
| 13.2 Special IP listening addresses
| -----------------------------------
[...]
| The default value of local_interfaces is
|
| local_interfaces = 0.0.0.0
|
| when Exim is built without IPv6 support; otherwise it is:
|
| local_interfaces = <; ::0 ; 0.0.0.0
|
| Thus, by default, Exim listens on all available interfaces, on the SMTP
| port.
OTOH for the other setups (no remote mail, smarthost) the default
value for the listening interfaces indeed only includes 127.0.0.1. Is
it actually a good idea to change this? I expect that this could cause
problems on ipv4-only hosts. Do people actually run ipv6-only hosts
(not even loopback ipv4)? Is this a usecase we should optimize for?
thanks, cu andreas
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