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Fix IPv6 gateway reachability with ND proxy #873

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Merged
sknat merged 1 commit into from
Feb 5, 2026
+19 −0
Merged

Fix IPv6 gateway reachability with ND proxy #873

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16 changes: 16 additions & 0 deletions vpp-manager/vpp_runner.go
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Original file line number Diff line number Diff line change
Expand Up @@ -664,6 +664,22 @@ func (v *VppRunner) configureVppUplinkInterface(
}
}

/*
* Add ND proxy for IPv6 gateway addresses.
* Without ND proxy for gateway, host's NS for gateway is dropped with "neighbor
* solicitations for unknown targets" error because there's no /128 FIB entry.
* This requires VPP patch https://gerrit.fd.io/r/c/vpp/+/44350 to fix NA loop bug.
*/
for _, route := range ifState.Routes {
if route.Gw != nil && route.Gw.To4() == nil {
log.Infof("Adding ND proxy for IPv6 gateway %s", route.Gw)
err = v.vpp.EnableIP6NdProxy(tapSwIfIndex, route.Gw)
if err != nil {
log.Errorf("Error configuring ND proxy for gateway %s: %v", route.Gw, err)
}
}
}

if *config.GetCalicoVppDebug().GSOEnabled {
err = v.vpp.EnableGSOFeature(tapSwIfIndex)
if err != nil {
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3 changes: 3 additions & 0 deletions vpplink/generated/vpp_clone_current.sh
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Expand Up @@ -124,6 +124,9 @@ git_cherry_pick refs/changes/69/43369/16 # https://gerrit.fd.io/r/c/vpp/+/43369
git_cherry_pick refs/changes/64/44464/9 # 44464: dispatch-trace: add filter support for pcap dispatch trace | https://gerrit.fd.io/r/c/vpp/+/44464
git_cherry_pick refs/changes/67/44467/7 # 44467: bpf_trace_filter: add raw IP packet support | https://gerrit.fd.io/r/c/vpp/+/44467

# fix unicast NA handling in VPP ND proxy
git_cherry_pick refs/changes/50/44350/3 # 44350: vnet: fix unicast NA handling in ND proxy | https://gerrit.fd.io/r/c/vpp/+/44350

# --------------- private plugins ---------------
# Generated with 'git format-patch --zero-commit -o ./patches/ HEAD^^^'
git_apply_private 0001-pbl-Port-based-balancer.patch
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