Why does not my net-snmp listen to UDP6:161?

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SNMP

The version of my Net-Snmp in my embedded system is v5.9.3, kind of new. It works fine except not listening to UDP6:161. The command to launch SNMP daemon is:

snmpd -c <path>/snmpd.conf -x /usr/builtin/var/agentx/master

, where master is the UDP socket file.

The content of snmpd.conf at the above command is:

Quote:

rocommunity xxxx localhost
rocommunity public
rocommunity6 public
agentaddress udp:161,udp6:161

I googled and found that it's said it is enough to make Net-Snmp listens to UDP6:161 in such way. But when I used command 'netstat -uln', I found only 'udp :::161', without the expected 'udp6 :::161'.

I traced its excution by turing on the debugging and found the following 4 lines of message:

Quote:

115895:snmp_agent: installing master agent on port udp:161
115953:snmp_agent: init_master_agent; "udp:161" registered as an agent NSAP
115955:snmp_agent: installing master agent on port udp6:161
116011:snmp_agent: init_master_agent; "udp6:161" registered as an agent NSAP

From them, it's obvious that the udp6 port has been listening and registered. But why is there no 'udp6: 161' was shown at output of 'netstat uln'?


So, what did I missed? What should I still need to do to make it's work for UDP6?

What I have tried:

I explored this issue at the web by googling lots of discussions but in vain.