Ok, additional information.
Compare this line in v5.8:
https://sourceforge.net/p/net-snmp/code/ci/master/tree/agent/agent_trap.c#l358
with this line
https://sourceforge.net/p/net-snmp/code/ci/v5.7.3/tree/agent/agent_trap.c#l251
You will see that v5.7 does not set a source. And because it does not set a
source it does not bind.
But maybe we want to bind? (Source says we want to reduce open ports but I
don't understand this)
Ok, but why bind on port 161? If understand correctly we want to SEND
traps. So we should bind localhost:<random high level port> ->
localhost:162 (address of our snmptrapd), but this does not happen.
Instead we get (note that netsnmp prints to->from):
netsnmp_udpbase: binding socket: 9 to UDP: [0.0.0.0]:0->[127.0.0.1]:161
netsnmp_udpbase: socket 9 bound to UDP: [127.0.0.1]:162->[127.0.0.1]:161
So why is socket bound on port 161 instead of some random high level port?
I didn't find where in code port 161 is set.
So I think the solution is that either port is unbound or random high level
port is chosen for binding.
I've also tried to set
clientaddr 127.0.0.1:<some high level port>
clientaddrUsesPort yes
because documentation says this will be used for clients but it also does
not work.
V V čet., 23. avg. 2018 ob 11:47 je oseba Martin Frlin <
martin.fr...@gmail.com> napisala:
> If you have line:
> trapsink localhost public
> in your config v5.8 fails to start. Meanwhile v5.3 starts with no problems.
>
> Am I missing something or is this a bug?.
>
> This output was generated using exactly the same config
> v5.8
> # snmpd -Dnetsnmp_udpbase -Lo -f
> registered debug token netsnmp_udpbase, 1
> Log handling defined - disabling stderr
> netsnmp_udpbase: open remote UDP: [127.0.0.1]:162->[0.0.0.0]:0
> netsnmp_udpbase: binding socket: 9 to UDP: [0.0.0.0]:0->[127.0.0.1]:161
> netsnmp_udpbase: socket 9 bound to UDP: [127.0.0.1]:162->[127.0.0.1]:161
> Turning on AgentX master support.
> netsnmp_udpbase: open local UDP: [127.0.0.1]:161->[0.0.0.0]:0
> netsnmp_udpbase: set IP_PKTINFO
> netsnmp_udpbase: binding socket: 8 to UDP: [0.0.0.0]:0->[127.0.0.1]:161
> netsnmp_udpbase: failed to bind for clientaddr: 98 Address already in use
> Error opening specified endpoint "udp:127.0.0.1:161"
> Server Exiting with code 1
>
>
> v5.3
> # snmpd -Dnetsnmp_udpbase -Lo -f
> registered debug token netsnmp_udpbase, 1
> Log handling defined - disabling stderr
> netsnmp_udpbase: open remote UDP: [127.0.0.1]:162->[0.0.0.0]:0
> netsnmp_udpbase: client open UDP: [127.0.0.1]:162->[0.0.0.0]:0
> Turning on AgentX master support.
> netsnmp_udpbase: open local UDP: [127.0.0.1]:161->[0.0.0.0]:0
> netsnmp_udpbase: set IP_PKTINFO
>
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