Re: 求救 RHEL5.1 AS 之 PREROUTING 遇到困難.
On 29 Jul 2008 08:38:05 GMT, kenduest.bbs@bbs.sayya.org (小州) wrote:
>※ 引述《Jacky@bcc.com (世界是平的)》之銘言：
>> 相同的 rule 於RHEL3 運作正常,但是搬到RHEL 5.1後就Fail,
>> 以下是測試的資料
>
> post "iptables-save" command output
>
>--
>-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
>
> 現代人普遍的現象: 「小學而大遺」、「捨本而逐末」
> 「以偏而概全」、「因噎而廢食」
>-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
感謝回覆不過仍然失敗......
執行iptables-save
[root@eip ~]# iptables-save
# Generated by iptables-save v1.3.5 on Thu Jul 31 19:29:37 2008
*nat
:PREROUTING ACCEPT [46413:6862988]
:POSTROUTING ACCEPT [5284:754821]
:OUTPUT ACCEPT [3688:516317]
-A PREROUTING -d 61.250.251.165 -p tcp -m tcp --dport 3392 -j DNAT
--to-destination 192.168.147.9:3389
-A PREROUTING -d 61.250.251.165 -p tcp -m tcp --dport 3900 -j DNAT
--to-destination 192.168.147.11:3389
-A POSTROUTING -p tcp -m tcp --dport 5190 -j DROP
-A POSTROUTING -d 64.12.162.57 -p tcp -j DROP
-A POSTROUTING -d 205.188.179.233 -p tcp -j DROP
......
......
......略
-A INPUT -i eth1 -p tcp -m tcp --dport 3900 -j ACCEPT
-A INPUT -i eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i eth1 -m state --state INVALID,NEW -j DROP
-A INPUT -i eth1 -j DROP
-A icmpfilter -i eth1 -p icmp -m icmp --icmp-type 18 -j ACCEPT
......
......
......略
COMMIT
# Completed on Thu Jul 31 19:29:37 2008
執行tcpdump 仍然失敗
[root@eip ~]# tcpdump -i eth1 -nn port 3900
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes
19:29:47.270324 IP 60.251.221.178.2350 > 61.250.251.165.3900: S
1053296189:1053296189(0) win 65535 <mss 1460,nop,nop,sackOK>
19:29:50.265909 IP 60.251.221.178.2350 > 61.250.251.165.3900: S
1053296189:1053296189(0) win 65535 <mss 1460,nop,nop,sackOK>
19:29:56.298861 IP 60.251.221.178.2350 > 61.250.251.165.3900: S
1053296189:1053296189(0) win 65535 <mss 1460,nop,nop,sackOK>
[3]+ Stopped tcpdump -i eth1 -nn port 3900
重新啟動iptables
[root@eip ~]# service iptables restart
正在清除防火牆規則: [ 確定 ]
正在設定 chains 為 ACCEPT 政策: nat filter [ 確定 ]
正在卸載 iptables 模組: [ 確定 ]
執行tcpdump 狀況不太一樣.... 但還是失敗
[root@eip ~]# tcpdump -i eth1 -nn port 3900
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes
19:30:28.102830 IP 60.251.221.178.2352 > 61.250.251.165.3900: S
1644470685:1644470685(0) win 65535 <mss 1460,nop,nop,sackOK>
19:30:28.102890 IP 61.250.251.165.3900 > 60.251.221.178.2352: R 0:0(0)
ack 1644470686 win 0
19:30:28.735750 IP 60.251.221.178.2352 > 61.250.251.165.3900: S
1644470685:1644470685(0) win 65535 <mss 1460,nop,nop,sackOK>
19:30:28.735787 IP 61.250.251.165.3900 > 60.251.221.178.2352: R 0:0(0)
ack 1 win 0
19:30:29.370788 IP 60.251.221.178.2352 > 61.250.251.165.3900: S
1644470685:1644470685(0) win 65535 <mss 1460,nop,nop,sackOK>
19:30:29.370827 IP 61.250.251.165.3900 > 60.251.221.178.2352: R 0:0(0)
ack 1 win 0
RHEK5.1 有一個視窗版的iptables防火牆, 它與 iptables script
的優先順序如何?
打開它或關閉它都不對....
請問還有那裡沒注意到?
多謝
討論串 (同標題文章)
完整討論串 (本文為第 3 之 8 篇)：