Good Afternoon,
I'm now working at a large UK university in their network support
department, as such one of my duties is to monitor the residences
network. To this end I have a cloned nic for every vlan that we have on
resnet. It roughly comes to over 50 vlans, and FreeBSD its self copes
very nicely.
However I've run into a small problem when using nmap (and a tiny one in
Ethereal). Unless you specify the source address and source interface
for scans nmap will open every network device with bpf. The problem
comes when it hits the 33rd interface to open, nmap exits.
[eclair:~]# nmap -P0 -p 1-65535 -sS 10.34.96.168
Starting nmap 3.93 ( http://www.insecure.org/nmap/ ) at 2005-10-17 14:03 BST
getinterfaces: Failed to open ethernet interface (resnet737)
QUITTING!
If I truss I get the following:
open("/dev/bpf29",0x1,01002230274) ERR#16 'Device busy'
open("/dev/bpf30",0x1,01002230274) ERR#16 'Device busy'
open("/dev/bpf31",0x1,01002230274) ERR#16 'Device busy'
write(2,0xbfbfab40,60) = 60 (0x3c)
getinterfaces: Failed to open ethernet interface (resnet737)
So the question is, how can I allow more then 32 bpf devices, in the old
4.X series I'd have just tagged a number on the end of the kernel line.
Any suggestions apreciated,
Pete.
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