FreeBSD call for testing: PREFSRC route attribute support <https://lists.freebsd.org/archives/freebsd-net/2026-July/009137.html>this lets you set the preferred source IP address for outgoing packets via a particular route, overriding the default source selection logic. it's particularly useful for IPv4-over-IPv6 routing; previously, BSD required assigning an IPv4 /32 to every interface for this to work properly; now, you can simply set the IPv4 loopback address as the preferred source.it's also useful in situation where the router has multiple IPv6 addresses and you want to select which is used, similar to the "net.inet.icmp.reply_src=lo0" sysctl for IPv4 (but it affects all outgoing connections, not just ICMP errors).it's also useful for IPv4 when you want to control this per-route rather than globally, especially if you're routing in multiple FIBs.basically, it's really useful for a lot of situations and i'd love to see it land, so please help test it.it is compatible with the Linux netlink API and works out of the box with BIRD (krt_prefsrc attribute).the main patch is this one: https://reviews.freebsd.org/D58294 - either use the 'download raw diff' link, or use 'git arc patch D58294' to apply it to a tree.you can send feedback directly to Pouria, or just reply to me and i'll forward it.#freebsd #ipv6 #networking
