MTR

"MTR combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool." Seems to have come with a stock Fedora 13:

sh-4.1# rpm -qa | grep mtr
mtr-0.75-6.fc13.x86_64
sh-4.1# 

It's sort of like the top of traceroute.

tcp timeout in linux kernel

Some processes on our systems leave idle connections which get cut off by our external firewall after a certain amount of time as per its intentional configuration. We're attempting to fix this by modifying the tcp timeout directly in the linux kernel. My colleague believes that echo'ing a new value into:

/proc/sys/net/ipv4/tcp_keepalive_time

that is lower than the default of 7200 seconds and which correlates better with the firewall timeout will fix our problem. I'll be curious if it works.

rootsh and sudosh

I'm considering using rootsh and sudosh on my servers.

Password Strength

I just referred someone to John P's How I'd Hack Your Weak Passwords.

Tunnel programs

Todo: try ptunnel ozymandns proxytunnel and SSH port forwaring,
Note: I'm on a bus reading a magazine with cool tricks with the above but I'm about to throw the magazine away.

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