Misc tips for using FreeBSD GSW and NAV 3.1.0:

Against a FreeBSD GSW with net-snmp (at least):
Using v2c caused drexelsnmp not giving the exceptions it gave with
v1, resulting in NAV not getting useful SNMP data.
Changed SimpleSnmp.java by setting setSnmpVersion(1).

On a FreeBSD GSW:
On a 64-bit OS, net-snmp 5.2.2 from ports is not 64-bit clean;
it uses IPv4 addressing 8 bytes long.
Easiest way to circumvent was to patch drexelsnmp's SNMPIPAddress.java
by changing drexelsnmp, see drexelsnmp.patch.

To get some support for it, use something like CiscoSwIOS.java.patch
(a temporary cludge to get some support, used as an example).

CiscoGw.java.patch contains support for FreeBSD vlan probing
(also contains something for old CatOS, but I am not quite sure about it).

(FreeBSD net-snmp got probed as Cisco.
Not my choice, but it got probed as such.)