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--- doc:appunti:net:source_routing [2025/10/07 10:50] – [Firewall dual homed e source routing con Shorewall] niccolo
+++ doc:appunti:net:source_routing [2025/10/07 10:56] (current) – [Firewall dual homed e source routing con Shorewall] niccolo
@@ Line 160: / Line 160: @@
 <file>
 # Dual-homed external interfaces require global ROUTE_FILTER=No in shorewall.conf.
+# The safe policy for connections with untrusted peers is to set accept_source_route to 0.
+# Notice: source route packets are nonsensical on a PPP link.
+accept_source_route = 0
 net    eth0    tcpflags,nosmurfs,sourceroute=0
 net    eth2    tcpflags,nosmurfs,sourceroute=0
-# Enable route filter (rp_filter kernel paramter) on the local interface.
+# Enable route filter (rp_filter kernel paramter) specifically on the local interface.
 loc    eth1    dhcp,routefilter=1
 </file>