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Hi. I'm a Unix Administrator, mathematics enthusiast, and amateur philosopher. This is where I rant about that which upsets me, laugh about that which amuses me, and jabber about that which holds my interest most: Unix.
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Old

iptables revisited

Posted 12-05-2013 at 03:05 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

I spent a bit of time revamping my iptables rules on a public torrent/voip server of mine, so I figured I would dump them here (sanitized) for future reference:

Code:
root@dfw:~# iptables -nvL
Chain INPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
   47  1896 LOG-DROP   all  --  *      *       0.0.0.0/0            0.0.0.0/0            ctstate INVALID /* SCANS AND SUCH? */
44350 6962K
...
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Old

Testing a new toy

Posted 11-30-2013 at 12:24 AM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

The other day while running a maintenance for a customer in which we had settled on communicating via IM, I noted that typing on my android was a pain. Sure, the on screen keyboard is ok if I'm texting a quick message or typing out a short explanation of the final deal, but going from my laptop to the android and back for each step was getting old...so I figured it was time to grab a bluetooth keyboard and wire it up to a Galaxy tablet and test it out...only my wife beat me to it and picked one...
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Old

RIP: bad value: NULL

Posted 09-18-2013 at 08:57 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

Spent a few days debugging what I thought was a bizarre kernel bug on a RHEL 6.3 box. We had crash utilities installed and I'd gotten incredibly comfortable with analyzing kernel crash dumps. I can also say that I'm intimately familiar with a few features of the Linux kernel that I didn't even know existed before.

If you know much about kernel debugging, you probably already know the fix (due to the subject line). See, when you analyze a kernel crash dump, you get certain information,...
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Old

tor as an...availability service?

Posted 07-24-2013 at 06:26 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

Last night my wife complained to me that facebook was taking forever to load. I figured it was just a hiccup somewhere between facebook and our home network, so I waited a bit to see.

An hour or so later, she was getting impatient, so I fired up a tcpdump session on the firewall and watched her desktop exchange a pretty funny set of packets (well, you had to be there, I suppose), loaded with PUSH, URG, and FIN packets back and forth between her desktop and facebook. I laughed and...
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Old

pcap_open_live(vlan2): vlan2: (all BPF devices are busy)

Posted 06-25-2013 at 02:42 PM by rocket357 (Musings on technology, philosophy, and life in the corporate world)

I can haz iftop x 5?

No, apparently not.

Code:
# lsof | grep bpf                                                       
iftop      1106    _iftop    4u    VCHR       23,5        0t0   58522 /dev/bpf5
dhclient  10196      root    5u    VCHR       23,9 0t15376716   58526 /dev/bpf9
iftop     10521    _iftop    4u    VCHR       23,8 0t30713975   58525 /dev/bpf8
dhclient  10789     _dhcp    5u    VCHR       23,9 0t15376716   58526 /dev/bpf9
...
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