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You say Tomato, I say Shibby

So, this Netgear router went on to become a brick and could not be resurrected from the dead. But I had an old WRT54GL still lying around that could be used until I decide which router to buy as a replacement.

Unfortunately, as the WRT54GL is now 10 years old, neither DD-WRT nor OpenWRT ships any recent version of their firmware for this model. So what else is out there?

Enter Tomato, yet another firmware-for-your-router-project. And while the original project appears to be dormant, many mods were created and some of them are still active. I went with the most recent one, called Tomato by Shibby which offers images with both the Linux 2.4 and 2.6 kernel. I went with the latest K26 release (for MIPS1) that would fit into the 4 MB of flash memory on this router:
$ w3m | grep MIPSR1 | sort -nk4
file         2015-08-06 3610
file             2015-08-06 3786
file          2015-08-06 4157
Verify the checksum:
$ wget
$ md5sum -c MD5SUM 2>&1 | grep OK
image/tomato-K26-1.28.RT-MIPSR1-131-MiniIPv6.trx: OK
The Tomato image can be installed through the DD-WRT or OpenWRT GUI, as the firmware should be recognized by both systems. On OpenWRT, this can also be done from the command line:
sysupgrade -v -n tomato.trx
With that, Tomato by Shibby was up & running on this old WRT54GL :-)
$ ssh router
Tomato v1.28.0000 MIPSR1-131 K26 MiniIPv6
 Welcome to the Linksys WRT54G/GS/GL [router]
 Uptime:  14:15:23 up 1 day, 14:40
 Load average: 0.22, 0.05, 0.01
 Mem : used 92.2% (11.78 of 12.78 MB)
 WAN : @ 00:12:23:34:45:56
 LAN : @ DHCP: -
 WL0 : SSID @ channel: Worldwide9 @ 00:12:34:56:78:90