Re: [dhcwg] Last Call: draft-ietf-dhc-dhcpv6-bulk-leasequery (DHCPv6 Bulk Leasequery) to Proposed Standard

[Pekka Savola <pekkas at netcore.fi>]

I was hoping some folks more intimate with SNMP and IETF management 
frameworks would chime in here, but I'll respond to clarify:

On Tue, 21 Oct 2008, Marcus wrote:
> I am not an expert on SNMP, but the only way I could imagine that
> working, would be by using queries for MIBs which would look like
> this:
>
> get <MIB>.<querytype>
>
> As the query type can be a relay id, link-address or remote id, this
> would look a bit strange to me. I know and use SNMP mostly for
> querying specific, predefined counters or tables, not variable entries
> in the MIB tree.

If I understand what you want to achieve, what you want is supported 
and indeed used by lots of MIB modules out there.  This is useful and 
indeed we use it regularly with e.g. BGP and IP forwarding MIBs:

$ snmpwalk -m IP-FORWARD-MIB -v 2c -c foo foo-rtr ip.ipForward.ipCidrRouteTable.ipCidrRouteEntry.ipCidrRouteProto.128.214.46
IP-FORWARD-MIB::ipCidrRouteProto.128.214.46.0.255.255.255.0.0.0.0.0.0 = INTEGER: netmgmt(3)
IP-FORWARD-MIB::ipCidrRouteProto.128.214.46.254.255.255.255.255.0.0.0.0.0 = INTEGER: local(2)

> Also all implementations I know, use UDP not TCP for SNMP queries 
> and replies. The DHCPv6 Bulk Leasquery proposal looks like a logical 
> next step to me.

An open-source SNMP implementation (net-snmp) is at least available. 
SNMP over TCP is defined in RFC3430. The systems under consideration 
already support TCP, just the TCP SNMP server part is missing; this 
should be trivial to implement if there is a need -- the lack of 
implementation efforts seems like an indication that UDP with 
retransmissions is usually "good enough".

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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