Package: courier-base Version: 0.61.2-1 Severity: important
Courier uses ipv4 in ipv6 dual-stack addresses. If the sysctl net/ipv6/bindv6only is set to 1, then connections to v4 in v6 mapped addresses will fail with "Network is unreachable." To be clear, the v4 in v6 mapped addresses appear as ::ffff:192.0.2.1, for example. Example output from courier's testmxlookup: loki:~# testmxlookup debian.org Domain debian.org: Relay: master.debian.org, Priority: 0, Address: ::ffff:70.103.162.29 According to ipv6(7), applications can override the system net/ipv6/bindv6only default by using setsockopt(2) to set the IPV6_V6ONLY option to 0. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
