From 95d537cbc13ae8bfe6518fe73d45d4bdb1da37ed Mon Sep 17 00:00:00 2001 From: Guilhem Moulin Date: Tue, 3 Nov 2020 16:44:35 +0100 Subject: Firewall: allow ICMP type 11 (time time-exceeded). This is in particular needed for traceroutes and routing loop detection. --- roles/common/templates/etc/nftables.conf.j2 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/roles/common/templates/etc/nftables.conf.j2 b/roles/common/templates/etc/nftables.conf.j2 index bbc0e7c..c89a136 100755 --- a/roles/common/templates/etc/nftables.conf.j2 +++ b/roles/common/templates/etc/nftables.conf.j2 @@ -57,7 +57,7 @@ table netdev filter { ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} meta secpath exists accept # rate-limiting is done directly by the kernel (net.ipv4.icmp_{ratelimit,ratemask} runtime options) - icmp type { echo-reply, echo-request, destination-unreachable } counter accept + icmp type { echo-reply, echo-request, destination-unreachable, time-exceeded } counter accept icmpv6 type { echo-reply, echo-request, destination-unreachable, packet-too-big, time-exceeded, parameter-problem } counter accept @@ -165,6 +165,7 @@ table inet filter { # ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} ipsec in reqid $i accept ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} meta secpath exists accept + # incoming ICMP/ICMPv6 traffic was filtered in the ingress chain already meta l4proto { icmp, icmpv6 } counter accept udp sport 123 udp dport 123 ct state related,established accept -- cgit v1.2.3