Enable IPv6 feed: run GoBGP in host network mode

The IPv6 eBGP session never established because the Docker bridge
has no IPv6. Switch the gobgp container to network_mode: host so it
uses the host's real dual-stack connectivity — both sessions to
AS57355 now source from the host's public v4/v6 addresses.

Host mode binds the host's port namespace, so disable GoBGP's
inbound BGP listener (port = -1) — we only originate outbound
sessions, and a non-root container cannot bind privileged port 179.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -427,6 +427,11 @@ services:
     restart: unless-stopped
     container_name: obmp-gobgp
     image: jauderho/gobgp:v4.5.0
+    # Host networking: the daemon uses the host's real IPv4 + IPv6 stack, so
+    # both the v4 and v6 eBGP sessions to AS57355 source from the host's
+    # public addresses (no Docker IPv6/NAT plumbing). BMP still reaches the
+    # collector on 10.40.40.202:5000 (its published port).
+    network_mode: host
     depends_on:
       - collector
     # gobgpd reads /config/gobgpd.conf; the same mount carries mrt-refresh.sh

gobgp/gobgpd.conf

@@ -14,9 +14,10 @@
   [global.config]
     as = 65001
     router-id = "10.40.40.250"
-    # Listen for inbound BGP on the standard port. We only originate
-    # outbound sessions, but the daemon still needs a listen port.
-    port = 179
+    # We only originate outbound sessions to the route server; disable the
+    # inbound BGP listener (port -1) so the daemon needs no privileged
+    # (<1024) bind -- required under docker network_mode: host.
+    port = -1
 
 # --- Neighbor: route server, IPv4 feed --------------------------------------
 # The IPv4 transport session carries the full IPv4 table only.