UNIX for Dummies Questions & Answers

Hello All!

New Unix admin here, with a bit of a problem I can't seem to get a straight answer to..

I've been tasked with mapping out the topology (with IPs/Hostnames) of networks...remotely. So, I have SSH access to firewalls, but that's about as far as I can get - how would I go about resolving the IPs/hostnames of the other servers on a network, such as a mail server.

Thanks!

Tiy

These remote networks belong to your company, correct?

Code:

nmap -sP 192.168.1.0/24

If You got nmap

Code:

for i in {1..254}; do ping -c 1 -W 1 10.1.1.$i | grep 'from'; done

If You do not got nmap

RolfB

Yes of course fpmurphy, we manage about 120 small companies and non-profits in the area. Most of these sites have poor documentation and we are working on building decent network topology that we can quickly reference.

What is the easiest way to match IPs to hostnames? I have a list of hostnames for most of our sites.

This may help You:

Code:

dig +short google.com

74.125.77.104
74.125.77.147
74.125.77.99

Code:

ping -c 1 google.com | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

74.125.77.104

Another tool I use is Superscan (Windows) who can generate an text file with hostname and IP + open ports if You need that too.
It is so "good" that I did not bother to make a script who does same.

RolfB