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[Linux-ha-jp] Heartbeat3で開かれるポートについて

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Tomoki BENIYA beniy****@bit-i*****
2011年 5月 16日 (月) 17:40:28 JST 

初めまして、紅谷と申します。

現在、Heartbeat3+PacemakerでHAを組んでおります。netstatを眺めていたら
気になる点があったので皆様のご意見を頂ければと思い、投稿しました。

■IP
hoge1
	eth0	203.0.113.1
	eth1	10.0.9.210
	eth2	172.16.0.1
hoge2
	eth0	203.0.113.2
	eth1	10.0.9.211
	eth2	172.16.0.2

2つのプライベート網でheartbeatを交換しています。netstatを見てみると、
それぞれのサーバでudp694とハイポートが0.0.0.0で2つ開けられ、ハイポート
がheartbeatパケットのソースポートになっています。
nmapで見ると「open|filtered」となり、空いてそうな結果も得られます。

皆様はこのハイポートをどうされていますでしょうか？Firewallで塞げば済む
話ではありますが、他に閉じる手段があればなぁと思っております。

皆様のご意見を頂ければ幸いです。
以上、よろしくお願いします。


以下、コマンドの結果等

■ha.cf
====================================================================================================
crm yes
logfile /var/log/ha.log
logfacility local0
keepalive 1
warntime 5
deadtime 10
udpport 694
mcast eth1 239.0.0.1 694 1 0
mcast eth2 239.0.0.2 694 1 0
node hoge1
node hoge2
====================================================================================================

■netstat
====================================================================================================
root ＠ hoge1:~# netstat -nap --udp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 239.0.0.2:694           0.0.0.0:*                           19246/heartbeat: wr
udp        0      0 239.0.0.1:694           0.0.0.0:*                           19244/heartbeat: wr
udp        0      0 0.0.0.0:53945           0.0.0.0:*                           19246/heartbeat: wr
udp        0      0 0.0.0.0:38781           0.0.0.0:*                           19244/heartbeat: wr

root ＠ hoge2:~# netstat -nap --udp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 239.0.0.2:694           0.0.0.0:*                           21878/heartbeat: wr
udp        0      0 239.0.0.1:694           0.0.0.0:*                           21876/heartbeat: wr
udp     1120      0 0.0.0.0:33302           0.0.0.0:*                           21876/heartbeat: wr
udp     2240      0 0.0.0.0:44321           0.0.0.0:*                           21878/heartbeat: wr
====================================================================================================

■tcpdump
====================================================================================================
root ＠ hoge1:~# tcpdump -ni eth1 port 38781
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
16:44:25.640260 IP 10.0.9.210.38781 > 239.0.0.1.694: UDP, length 211
16:44:26.641209 IP 10.0.9.210.38781 > 239.0.0.1.694: UDP, length 211
16:44:27.642257 IP 10.0.9.210.38781 > 239.0.0.1.694: UDP, length 211
16:44:28.643265 IP 10.0.9.210.38781 > 239.0.0.1.694: UDP, length 211
16:44:29.644435 IP 10.0.9.210.38781 > 239.0.0.1.694: UDP, length 211

root ＠ hoge1:~# tcpdump -ni eth2 port 53945
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
16:44:38.644368 IP 172.16.0.1.53945 > 239.0.0.2.694: UDP, length 211
16:44:39.645460 IP 172.16.0.1.53945 > 239.0.0.2.694: UDP, length 211
16:44:40.646420 IP 172.16.0.1.53945 > 239.0.0.2.694: UDP, length 206
16:44:40.646447 IP 172.16.0.1.53945 > 239.0.0.2.694: UDP, length 211
16:44:41.647418 IP 172.16.0.1.53945 > 239.0.0.2.694: UDP, length 211
====================================================================================================
root ＠ hoge2:~# tcpdump -ni eth1 port 33302
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
15:05:28.771098 IP 10.0.9.211.33302 > 239.0.0.1.694: UDP, length 211
15:05:29.772038 IP 10.0.9.211.33302 > 239.0.0.1.694: UDP, length 211
15:05:30.773429 IP 10.0.9.211.33302 > 239.0.0.1.694: UDP, length 211
15:05:31.774360 IP 10.0.9.211.33302 > 239.0.0.1.694: UDP, length 211
15:05:32.775716 IP 10.0.9.211.33302 > 239.0.0.1.694: UDP, length 211

root ＠ hoge2:~# tcpdump -ni eth2 port 44321
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
15:05:14.775475 IP 172.16.0.2.44321 > 239.0.0.2.694: UDP, length 211
15:05:15.215703 IP 172.16.0.2.44321 > 239.0.0.2.694: UDP, length 206
15:05:15.776465 IP 172.16.0.2.44321 > 239.0.0.2.694: UDP, length 211
15:05:16.777411 IP 172.16.0.2.44321 > 239.0.0.2.694: UDP, length 211
15:05:17.778548 IP 172.16.0.2.44321 > 239.0.0.2.694: UDP, length 206
====================================================================================================

■nmap
====================================================================================================
 test# nmap -sU 203.0.113.1 -p 694,38781,53945

Starting Nmap 5.50 ( http://nmap.org ) at 2008-12-18 05:49 JST
Nmap scan report for 14.128.30.3
Host is up (0.00049s latency).
PORT      STATE         SERVICE
694/udp   closed        ha-cluster
38781/udp open|filtered unknown
53945/udp open|filtered unknown

Nmap done: 1 IP address (1 host up) scanned in 1.50 seconds
====================================================================================================
 test# nmap -sU 203.0.113.2 -p 694,33302,44321

Starting Nmap 5.50 ( http://nmap.org ) at 2008-12-18 05:49 JST
Nmap scan report for 14.128.30.4
Host is up (0.00066s latency).
PORT      STATE         SERVICE
694/udp   closed        ha-cluster
33302/udp open|filtered unknown
44321/udp open|filtered unknown

Nmap done: 1 IP address (1 host up) scanned in 1.51 seconds
====================================================================================================

-- 
Tomoki BENIYA <beniy****@bit-i*****>


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