From 6dbe3d82d19b0f990008a173b90254430da30f48 Mon Sep 17 00:00:00 2001
From: Viktor Liu <viktor@netbird.io>
Date: Mon, 4 May 2026 12:28:53 +0200
Subject: [PATCH] Allow ICMPv6 Parameter Problem through peer ACL

---
 client/firewall/uspfilter/filter.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/client/firewall/uspfilter/filter.go b/client/firewall/uspfilter/filter.go
index e5d1459e4..7db1698ec 100644
--- a/client/firewall/uspfilter/filter.go
+++ b/client/firewall/uspfilter/filter.go
@@ -1374,7 +1374,8 @@ func (m *Manager) isSpecialICMP(d *decoder) bool {
 		icmpType := d.icmp6.TypeCode.Type()
 		return icmpType == layers.ICMPv6TypeDestinationUnreachable ||
 			icmpType == layers.ICMPv6TypePacketTooBig ||
-			icmpType == layers.ICMPv6TypeTimeExceeded
+			icmpType == layers.ICMPv6TypeTimeExceeded ||
+			icmpType == layers.ICMPv6TypeParameterProblem
 	}
 	return false
 }