1,340 reputation
179
bio website redhardsupra.blogspot.com
location Laurel, MD
age 37
visits member for 5 years, 1 month
seen 10 hours ago

Jan
7
comment I/O Performance Benchmarking Linux
Using SSH add's a CPU-bound component, so you can develop a bottleneck when testing on slow CPUs. Use netcat/socat instead and then you have next to no overhead.
Jan
3
answered Strange 3-second tcp connection latencies (Linux, HTTP)
Dec
29
comment optimal folder structure for storing 100k files on a USB drive
Wouldn't it be just easier to empirically test the different scenarios instead of guessing?
Dec
29
answered How can I test the security of my server?
Dec
20
answered Stress test serial port, any available software?
Dec
10
answered ARP packets never routed?
Dec
7
comment Windows 2008 Server on mixed ethernet speeds — download from share slow, but fast plain TCP
Did you try using a different NIC, switch, and cabling? It might be something as simple as hardware going bad.
Dec
4
answered Dropped packets in Linux
Dec
1
answered Simulating a slow connection with tc
Nov
29
comment Increasing Apache Server Availability
Are you invoking the Perl script through CGI or mod_perl?
Nov
29
comment Apache Default Permissions
Proper ownership might not be enough if the permissions are too lax. Add chmod -R 400 to everything that is read-only content.
Nov
28
comment How do I make tcpdump not print the tcp headers?
with tshark you can do it with: tshark -l -i eth0 -f 'port 6667 and greater 74' -T field -e data
Nov
23
comment Tools a Unix administrator cannot live without
I've recently started using socat as netcat's replacement and I've been amazed at the number of options it gives you. Definitely worth checking out, despite scary amount of switches and weird syntax.
Nov
18
comment Does enabling hardware x86 virtualization (AMD-V or Intel VT-x) slow down my computer if I'm not running virtual machines?
VT-x and VT-d are just extra instructions in your CPU. Not using them has the same exact impact as not using any other instructions--none ;)
Nov
10
comment bridge in linux
Out of the man page: "brctl setfd <bridge> <time> sets the bridge’s ’bridge forward delay’ to <time> seconds." by default it's 30 seconds, so I'm guessing that's what you're experiencing. Set it to 0 right after you bring up the bridge interface.
Nov
1
comment Disable HTTP Methods in Apache
Mod_rewrite also runs slow regex on every URL process, which slows the server down. Use with caution.
Nov
1
answered what is the point of stripping a binary/elf program?
Oct
27
answered How to exploit data being written to file
Oct
18
answered Linux tool for IPv6 unsolicited neighbor advertisements
Oct
18
comment Linux tool for IPv6 unsolicited neighbor advertisements
Are you trying to force the new MAC<->IPv6 mappings on your local segment's neighbours?