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偶是linux初学者 为单位电脑做了一台linux代理服务器,刚装前两天网络运行正常,ping sina 12 ms 不会出现任何丢包现象 ,但是今天早晨一来 网络性能急剧下降,重启后依然 ping sina 会出现 10-20%的丢包 达到>;1000ms
百思不得其解,请高手指点指点谢谢
PIII 800 640M RAM 8G HDD
按部门分成了4个网段 eth0:4 有DHCP自动分配
eth0 eth0:2 eth0:3 eth0:4 内网
eth1 外网
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#ifconfig
eth0 Link encap:Ethernet HWaddr 00:05:5D:05:BD:89
inet addr:192.168.0.254 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:838005 errors:0 dropped:0 overruns:0 frame:0
TX packets:740577 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:289038364 (275.6 Mb) TX bytes:421759281 (402.2 Mb)
Interrupt:10 Base address:0xd800
eth0:2 Link encap:Ethernet HWaddr 00:05:5D:05:BD:89
inet addr:192.168.2.254 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:646387 errors:0 dropped:0 overruns:0 frame:0
TX packets:793635 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:388479785 (370.4 Mb) TX bytes:283290034 (270.1 Mb)
Interrupt:10 Base address:0xd800
eth0:3 Link encap:Ethernet HWaddr 00:05:5D:05:BD:89
inet addr:192.168.3.254 Bcast:192.168.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:646387 errors:0 dropped:0 overruns:0 frame:0
TX packets:793635 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:388479785 (370.4 Mb) TX bytes:283290034 (270.1 Mb)
Interrupt:10 Base address:0xd800
eth0:4 Link encap:Ethernet HWaddr 00:05:5D:05:BD:89
inet addr:192.168.4.254 Bcast:192.168.4.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:646387 errors:0 dropped:0 overruns:0 frame:0
TX packets:793635 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:388479785 (370.4 Mb) TX bytes:283290034 (270.1 Mb)
Interrupt:10 Base address:0xd800
eth1 Link encap:Ethernet HWaddr 00:50:BA:68:47:05
inet addr:192.168.1.254 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:646387 errors:0 dropped:0 overruns:0 frame:0
TX packets:793635 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:388479785 (370.4 Mb) TX bytes:283290034 (270.1 Mb)
Interrupt:11 Base address:0xe000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:538 errors:0 dropped:0 overruns:0 frame:0
TX packets:538 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:50372 (49.1 Kb) TX bytes:50372 (49.1 Kb)
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iptables
modprobe ip_tables
modprobe ip_nat_ftp
modprobe ip_conntrack
modprobe ip_conntrack_ftp
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3721
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth1 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 192.168.3.0/24 -o eth1 -j MASQUERADE
iptables -t nat -A POSTROUTING -s 192.168.4.0/24 -o eth1 -j MASQUERADE
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT |
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