HowTo reset/enter a Linksys WRT54GL without knowing its IP
Posted: Sat Mar 26, 2011 6:11 pm
I've just found my old Linksys WRT54GL router which I, years ago, flashed to FreiFunk firmware (v1.2.5) to use it as a FunkFeuer node.
Now, I'd like to use it for its original purpose again: A wireless router.
But, I've played around with the FreiFunk configuration a lot, and it was faaaaaar away from default settings - and years ago - so I did not know how to "find" my WRT54GL in my network.
a) First guess: Try DHCP!
Yeah, right.
If DHCP would have been activated, I would not write this HowTo.
b) OpenWRT failsafe mode:
That one is great!
FunkFeuer is based on OpenWRT, and therefore also has the failsafe mode.
Here's how:
1) Turn the router off. Unplug the power.
2) connect any LAN port of the router directly to the network card of your PC
3) Assign any 192.168.1.x IP address to your PC (e.g. 192.168.1.5)
4) During startup of the router device, OpenWRT tells you when to press the reset button to enter the failsafe mode. You just have to "listen":
5) Now power on the router (and prepare to press the reset button on the back)
6) After a few seconds, tcpdump will spit out a message like this:
telnet to 192.168.1.1, and you'll get a nice welcome shell prompt like this:
Now, I'd like to use it for its original purpose again: A wireless router.
But, I've played around with the FreiFunk configuration a lot, and it was faaaaaar away from default settings - and years ago - so I did not know how to "find" my WRT54GL in my network.
a) First guess: Try DHCP!
Yeah, right.
If DHCP would have been activated, I would not write this HowTo.
b) OpenWRT failsafe mode:
That one is great!
FunkFeuer is based on OpenWRT, and therefore also has the failsafe mode.
Here's how:
1) Turn the router off. Unplug the power.
2) connect any LAN port of the router directly to the network card of your PC
3) Assign any 192.168.1.x IP address to your PC (e.g. 192.168.1.5)
4) During startup of the router device, OpenWRT tells you when to press the reset button to enter the failsafe mode. You just have to "listen":
Code: Select all
tcpdump -i eth0 -n -A host 192.168.1.16) After a few seconds, tcpdump will spit out a message like this:
7) Press "reset" on the back of the router15:47:13.862070 IP 192.168.1.1.2048 > 192.168.1.255.4919: UDP, length 1001
E.....@.@..............7...+..Press reset now, to enter Failsafe!.................
telnet to 192.168.1.1, and you'll get a nice welcome shell prompt like this:
Code: Select all
telnet 192.168.1.1Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
BusyBox v1.01 (2006.04.12-12:05+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
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)__) F R E I F U N K F I R M W A R E
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