Skip to content

fix: Support multiple routes to the same IPv6 prefix through differen… #3

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
nozols merged 1 commit into from
Sep 17, 2026
+41 −0
Merged

fix: Support multiple routes to the same IPv6 prefix through differen… #3

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions NetworkManager-1.42.4/debian/changelog
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,3 +1,10 @@
network-manager (1.42.4-1+athom3) bookworm; urgency=medium

* Support multiple routes to the same IPv6 prefix through different
gateways learned from router advertisements

-- Niels de Boer <niels.deboer@athom.nl> Mon, 15 Sep 2026 14:31:16 +0200

network-manager (1.42.4-1+athom2) bookworm; urgency=medium

* Always enable SAE H2E
Expand Down
1 change: 1 addition & 0 deletions NetworkManager-1.42.4/src/core/ndisc/nm-ndisc.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -704,6 +704,7 @@ nm_ndisc_add_route(NMNDisc *ndisc, const NMNDiscRoute *new_item, gint64 now_msec
* comparison is aborted, and both routes are added.
*/
if (IN6_ARE_ADDR_EQUAL(&item->network, &new_item->network) && item->plen == new_item->plen
&& IN6_ARE_ADDR_EQUAL(&item->gateway, &new_item->gateway)
&& item->on_link == new_item->on_link) {
if (new_item->expiry_msec <= now_msec) {
g_array_remove_index(rdata->routes, i);
Expand Down
33 changes: 33 additions & 0 deletions ndisc-ra-filter.patch
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@
From f766059ea8c4717cdd3b4f65372c1ad233403377 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Mon, 27 Mar 2023 17:48:34 +0200
Subject: [PATCH] ndisc: support multiple gateways for a single network

Also check for gateway equality when deduplicate routing entries. This
allows to support multiple routes to the same network using different
gateways. This is useful for Thread networks where multiple BRs route
to the same Thread network. If one of these BRs go offline, fallback to
a different router will be much quicker if multiple entries are present.

Note that quick fallback to a different router requires IPv6
reachability probe to be active. Typically Linux disables reachability
probes on Linux machines which act as IPv6 gateway (when forwarding is
enabled).
---
src/core/ndisc/nm-ndisc.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/src/core/ndisc/nm-ndisc.c b/src/core/ndisc/nm-ndisc.c
index ca646a6dad..a7b1adbe23 100644
--- a/src/core/ndisc/nm-ndisc.c
+++ b/src/core/ndisc/nm-ndisc.c
@@ -703,6 +703,7 @@ nm_ndisc_add_route(NMNDisc *ndisc, const NMNDiscRoute *new_item, gint64 now_msec
* comparison is aborted, and both routes are added.
*/
if (IN6_ARE_ADDR_EQUAL(&item->network, &new_item->network) && item->plen == new_item->plen
+ && IN6_ARE_ADDR_EQUAL(&item->gateway, &new_item->gateway)
&& item->on_link == new_item->on_link) {
if (new_item->expiry_msec <= now_msec) {
g_array_remove_index(rdata->routes, i);
--
GitLab