Hi,
After I send alarm/trap each time from the sub-agent to master agent on
net-snmp platform, the size of the Recv-Q of the source socket gets
increased as follows:
[EMAIL PROTECTED] root]# netstat -ap | grep 1055
tcp 0 0 localhost.localdom:1055 *:*
LISTEN 17367/snmpd
tcp 5648 0 localhost.localdo:34976 localhost.localdom:1055
ESTABLISHED 17382/proSWagntdGSA
tcp 0 0 localhost.localdom:1055 localhost.localdo:34976
ESTABLISHED 17367/snmpd
After sending alarm:
[EMAIL PROTECTED] root]# netstat -ap | grep 1055
tcp 0 0 localhost.localdom:1055 *:*
LISTEN 17367/snmpd
tcp 7152 0 localhost.localdo:34976 localhost.localdom:1055
ESTABLISHED 17382/proSWagntdGSA
tcp 0 0 localhost.localdom:1055 localhost.localdo:34976
ESTABLISHED 17367/snmpd
snmpd (master agent) sends unexpected response after every snmp trap
sent from subagent using a shared library.
[EMAIL PROTECTED] root]# tcpdump -i lo port 34976 -s 1500 -w /var/log/dump1.txt
tcpdump: listening on lo
12 packets received by filter
0 packets dropped by kernel
[EMAIL PROTECTED] root]# tcpdump -v -r /var/log/dump1.txt
23:59:10.162329 localhost.localdomain.34976 >
localhost.localdomain.1055: P [bad tcp cksum 42db!] 744:1488(744) ack
753 win 30511 <nop,nop,timestamp 43270216 43270113> (DF) [ttl 0] (id
17963, len 796)
23:59:10.162873 localhost.localdomain.1055 >
localhost.localdomain.34976: P [bad tcp cksum c986!] 753:1505(752) ack
1488 win 32767 <nop,nop,timestamp 43270216 43270216> (DF) [ttl 0] (id
24898, len 804)
23:59:10.162909 localhost.localdomain.34976 >
localhost.localdomain.1055: . [tcp sum ok] ack 1505 win 29759
<nop,nop,timestamp 43270216 43270216> (DF) [ttl 0] (id 17964, len 52)
As a result receiving queue is growing, getting overflowed and we stop
sending SNMP traps further.
Is there any way to prevent this response to be delivered to subagent?
Is there any API to drain receiving queue?
What is the recommendation for troubleshooting?
Please help me.
OS details:
[EMAIL PROTECTED] app]$ uname -a
Linux nas1 2.4.21-15.ELsmp #1 SMP Thu Apr 22 00:18:24 EDT 2004 i686 i686
i386 GNU/Linux
[EMAIL PROTECTED] app]$ cat /etc/redhat-release
Red Hat Enterprise Linux WS release 3 (Taroon Update 2)
Net_SNMP version used:
[EMAIL PROTECTED] app]$ rpm -qa | grep -i net-snmp
net-snmp-devel-5.0.9-2.30E.3
net-snmp-5.0.9-2.30E.3
net-snmp-utils-5.0.9-2.30E.3
[EMAIL PROTECTED] root]# /usr/sbin/snmpd -version
NET-SNMP version: 5.0.9
Web: http://www.net-snmp.org/
Email: [EMAIL PROTECTED]
Thanks
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