Please scan softly - your router could crash

[J65nko]

From http://www.h-online.com/security/new...h-1032725.html

An nmap scan with certain parameters is apparently sufficient to temporarily cripple a whole corporate network. On the Full Disclosure mailing list, a network admin reported that he used the following command to establish the SNMP versions of his routers and servers:

nmap -sU -sV -p 161-162 -iL target_file.txt

where target_file.txt contained his systems' IP addresses. However, the scan caused most of his network devices to crash and reboot, including several Cisco routers. There were very varied responses to his question on the list whether this problem was caused by a DoS vulnerability within the devices or by a flawed configuration.

[BSDfan666]

But our routers run BSD, J65nko, you should know that.

[Mr-Biscuit]

Why is the p flag separated from the numbers?
If you are searching for open ports, you do not need to specify.
There's a UDP scan and a TCP scan running at the same time.
Passive or even active fingerprinting should be done either separately or with another application.