X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/a83c9611b4ea63ebe1432fad05593f23ae1d1f6b..32110b35da9d3ed1ce9668d3f17c28100a878687:/radius.m4

diff --git a/radius.m4 b/radius.m4
index ecf64b7..b8481bb 100644
--- a/radius.m4
+++ b/radius.m4
@@ -28,19 +28,10 @@ m4_divert(86)m4_dnl
 ## Externally visible services.
 allowservices inbound tcp \
 	ident \
-	dns iodine \
 	ssh
 allowservices inbound udp \
-	dns iodine \
 	tripe
 
-## Provide DNS resolution to local untrusted hosts.
-for p in tcp udp; do
-  run iptables -A inbound -j ACCEPT \
-	  -s 172.29.198.0/24 \
-	  -p $p --destination-port $port_dns
-done
-
 ## Provide syslog for evolution.
 run iptables -A inbound -j ACCEPT \
 	-s 172.29.198.2 \
@@ -48,6 +39,7 @@ run iptables -A inbound -j ACCEPT \
 
 ## Other interesting things.
 dnsresolver inbound
+dnsserver inbound
 
 ## IPv6 6-in-4 tunnel.
 run iptables -A inbound -j ACCEPT \
@@ -74,13 +66,18 @@ run iptables -t nat -F
 run iptables -t nat -X
 
 run iptables -t nat -N outbound
-run iptables -t nat -A outbound -j RETURN ! -o eth0
+run iptables -t nat -A outbound -j RETURN ! -o ppp0
 run iptables -t nat -A outbound -j RETURN ! -s 172.29.198.0/23
 run iptables -t nat -A outbound -j RETURN -d 62.49.204.144/28
 run iptables -t nat -A outbound -j RETURN -d 172.29.198.0/23
 run iptables -t nat -A outbound -j SNAT --to-source 62.49.204.158
 run iptables -t nat -A POSTROUTING -j outbound
 
+## TCP MSS clamping to help given Demon's sluggish approach to fragmentation-
+## needed errors.
+run ip46tables -t mangle -A FORWARD -o ppp0 -p tcp --tcp-flags SYN,RST SYN \
+	-j TCPMSS --clamp-mss-to-pmtu
+
 ## Set up NAT protocol helpers.  In particular, SIP needs some special
 ## twiddling.
 run modprobe nf_conntrack_sip \
@@ -91,7 +88,10 @@ for p in ftp sip h323; do
   run modprobe nf_nat_$p
 done
 
-## Forbid anything complicated to the NAT address.
+## Forbid anything complicated to the NAT address.  Be sure to allow ident,
+## though.
+run iptables -A INPUT -d 62.49.204.158 -p tcp -j ACCEPT \
+	-m multiport --destination-ports=113
 run iptables -A INPUT -d 62.49.204.158 ! -p icmp -j REJECT
 
 m4_divert(-1)