iptables+squid下联众的问题?

pianzhi

系统为Redhat9 带的iptables+squid透明代理最多带100多台机，上网正常，就是在玩联众时，当客户机较少时基本正常，但是当客户机>;30台时，联众就会出现掉线、服务器被复位等情况，5－10分钟一次，以前用ipchains时就没有这种情况，此外我试过用BBIagent也有这种情况，百思不得其解？
现贴上iptables规则，敬请各位大虾指点一下，到底问题出在那里？？

eth0=192.168.0.1 接内网
eth1=192.168.1.* 接外网（dhcp）

#!/bin/sh
Disable ICMP Redirect Acceptance
for FILE in /proc/sys/net/ipv4/conf/*/accept_redirects; do
echo 0 >; $FILE
done
# Disable Source Routed Packets
for FILE in /proc/sys/net/ipv4/conf/*/accept_source_route; do
echo 0 >; $FILE
done
# Log Spoofed Packets, Source Routed Packets, Redirect Packets
for FILE in /proc/sys/net/ipv4/conf/*/log_martians; do
echo 1 >; $FILE
done
echo "1" >;/proc/sys/net/ipv4/ip_forward
iptables -F
iptables -X
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
# localhost and ethernet.
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -i eth0 -j ACCEPT
iptables -N block
# Let em through.
iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A block -i eth0 -j ACCEPT
iptables -A block -p 47 -i eth1 -j ACCEPT
iptables -A block -p 50 -i eth1 -j ACCEPT
iptables -A block -p tcp --source-port 67:68 --destination-port 67:68 -i eth1 -j ACCEPT
iptables -A block -p udp --source-port 67:68 --destination-port 67:68 -i eth1 -j ACCEPT
iptables -A block -p icmp -i eth1 -d 192.168.1.0/255.255.255.0 -j ACCEPT
iptables -A INPUT -j block
iptables -A INPUT -j LOG
iptables -A INPUT -j REJECT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -o eth1 -j ACCEPT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -i eth1 -j ACCEPT
iptables -A FORWARD -m state --state NEW -o eth1 -j ACCEPT
iptables -A FORWARD -j LOG
iptables -A FORWARD -j REJECT
iptables -t nat -F
iptables -t nat -X
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE