> From: Dave Shield [mailto:d.t.shi...@liverpool.ac.uk]
> Sent: Wednesday, April 15, 2009 12:25 AM
> 2009/4/15 Richard Gipps <richa...@triodatacom.com>:
> > There does not seem to be anything in the RFCs on maximum community
> > string lengths.
>
> Correct.
> The specs implicitly allow an arbitrary length string
> (although there may be some limit imposed by ASN.1
> or BER - I'm not sure offhand).
Over a million octets, IIRC.
> > Is there some defacto standard for maximum length.
>
> The main restriction will be from MIB objects that take
> a community string as their value.
There's another aspect to take into account. SNMP is run over UDP in
the (vast) majority of cases, and therefore all information in a request or
response must fit into a single UDP packet. I'd have to consult references for
the exact number, but there's about 1300+ bytes available for UDP packets over
a standard ethernet link. Since you need to put varbinds in the packet, too,
the space fills up quickly.
Soooo... the rule of thumb is that if you're asking how big a community
string can get, you're probably thinking about doing something you'll regret
later.
HTH,
Mike
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