I've just done a simple nmap scan of my network with nmap:
nmap -sP 192.168.1.1-255

```
networkserver@networkServer:~$ sudo nmap -sP 192.168.1.1-255

Starting Nmap 5.00 ( http://nmap.org ) at 2010-08-26 17:46 NZST
Host RTA1320.home (192.168.1.1) is up (0.00060s latency).
MAC Address: 00:26:B6:C9:E7:48 (Unknown)
Host 192.168.1.2 is up (0.00057s latency).
MAC Address: 00:23:69:16:85:D7 (Cisco-Linksys)
Host 192.168.1.3 is up (0.00015s latency).
MAC Address: 02:27:19:B4:61:DB (Unknown)
Host networkServer (192.168.1.50) is up.
Host 192.168.1.104 is up (0.0012s latency).
MAC Address: 00:1A:4D:9C:70:0E (Giga-byte Technology Co.)
Host 192.168.1.109 is up (0.0076s latency).
MAC Address: 78:E4:00:8E:FE:63 (Unknown)
Nmap done: 255 IP addresses (6 hosts up) scanned in 28.74 seconds
```

That seemed to take a rather long time, so I check with a friend on his network and it only took 2.74 secconds!

My network layout is:

```
                             /---WifiRouter----#laptop>
Modem----server---switch---->
                             \---#devbox
```

I figure something is wrong with the routing settings on my network but I'm not sure how to check it? Any ideas?