Can’t login via telnet in ddwrt

Unfortunately, the impression I get (from the DD-WRT forums) is that you can only block domains under Access Restrictions in the DD-WRT setup.

I've decided instead to set up a dedicated proxy server with DansGuardian installed on it, which will allow me a fine level of control, and block any requests that don't go through the proxy on the router using iptables in OpenWrt.

Looking in

/tmp/.ipt
/tmp/.rc_firewall

gives exactly what I was looking for: the iptables rules as they would normally be in a file like /etc/sysconfig/iptables.

I had earlier found this:

dd if=/dev/mem | strings | grep -i iptables

...and fortunately, it works on the pared-down DD-WRT filesystem. It didn't give precisely what I was looking for, but it output quite a bit of info I hadn't been able to pinpoint any other way (or at least not with a single command).

Still have to determine which things are actually in effect by comparing with the output of

iptables -L -vn --line-numbers
iptables -L -vn -t nat --line-numbers
iptables -L -vn -t mangle --line-numbers

I also discovered that the grep command actually does work [my apologies for initially stating that it didn't-- I would've sworn it didn't work the last times I had tried. Mea maxima culpa.] Using grep, I found that the

/lib/services.so

also has a wealth of iptables configuration in it.