| Discover custom Internal IP of router Using a command prompt from an attached laptop, how do I discover the internal IP of an unused router which I set to a custom value and forgot? The router is not currently in use for internet access. I would like to access the control panel of the router without resetting it.
I attached my laptop to the router with an RJ45 cable and disabled the laptop's wireless adapter to avoid conflicts with my current network. Using an elevated command prompt, I did an "ipconfig /release", rebooted and ran "ipconfig /all", but the gateway entry is blank. An "arp -a" returns 169.254.190.120 as the only interface. A "netstat -a" returns 169.254.190.120:xx...'s, 127.0.0.1:xx...'s, and 0.0.0.0:xx...'s, but no router internal IP address.
Is there a way discover the gateway address without resetting the router?
Thanks,
Greg
Cisco/Linksys E3000, flashed with DD-WRT. |
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Bink
join:2006-05-14
Denver, CO
kudos:4 | Fire up a packet capture utility and reboot the router. Chances are it’ll advertise its IP upon startup in the form of an ARP broadcast and many other things. |
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bdnhsv
join:2012-01-20
Huntsville, AL | reply to semiarid
If you're connected directly to the router and have rebooted your pc (or released/renewed your IP) and your IP is in the 169.X.X.X range then you're not getting an IP lease from the router. If you had the router configured to act as a DHCP server then this would probably indicate that something is not working correctly in the router. If you remember the network range that you might have configured for the router (say 192.168.20.X) then you should manually configure your pc for an IP in this range and then you can scan for other active IP's in that range (I like angry IP scan, but there are tons of other utilities on the net). If you can't recall the range you might end up having to factory reset the router and re-configure. |
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 cdruGo ColtsPremium,MVM
join:2003-05-14
Fort Wayne, IN
kudos:5 | reply to semiarid
Is there something that you need off of it? If Bink's suggestion of just listening during a reboot doesn't pan out, I'd just do a 30-30-30 reset and set it back up unless there is something unrecoverable that you need off of it. |
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| Thanks for all the responses.  I downloaded Wireshark and used Bink's suggestion of rebooting the router. Worked like a charm! DHCP had been disabled, resulting in the problem that bdnhsv had alluded to. I ended up doing a 30-30-30 per cdru, and flashing to Tomato. This time I'll remember to upload the details to Evernote, and back up the settings so that if I reset the router it will save a little time and preserve any scripts installed. Next up is Qos for VOIP, and unattended bandwidth monitoring, but those questions are best left to new threads, methinks!
Thanks again,
Greg |
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