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Security Open Source

Shoreline Firewall (Shorewall) : Iptables Made Easy.
Snort : the de facto standard for intrusion detection/prevention, IDS, IPS
Clam AV : Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways.
SpamAssassin : The Apache SpamAssassin Project. The Powerful #1 Open-Source Spam Filter.
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Free Security Software

Active Virus Shield : Free Anti-Virus Protection, is brought to you as a free service of AOL and is based on Kaspersky Lab’s award winning Personal Anti-Virus.
Ad-Aware SE Personal : The Lavasoft name is synonymous with antispyware.
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Security Appliance

SRAN : Security Center, prevent cyber attacks against your critical infrastructures.
Easy-App : Millinux, Group Manager
WatchGuard Firebox X : The security You Really Need.
Astaro : Security Gateway Aplliance.
Barracuda : Instrusion Prevention System, SPAM Firewall, SSL VPN Appliance.
FORTINET : Security Simplified, Complete Content Protection.
3COM TipppingPoint : The World's fastest Intrusion Prevention Systems (IPS)
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windows faq command line

nbtstat (Microsoft Windows) : Displays protocol statistics and current TCP/IP connections using NBT (NetBIOS over TCP/IP).
netsh interface ip show config : view your TCP/IP settings
netsh interface ip set address name="Local Area Connection" static 192.168.0.100 255.255.255.0 192.168.0.1 1 : configure your computer's IP address and other TCP/IP related settings
netsh -c interface dump > c:\location1.txt : export your current IP settings on location 1
netsh -c interface dump > c:\location2.txt : export your current IP settings on location 2
netsh -f c:\location1.txt : import your IP settings from location 1 with -f
netsh exec c:\location2.txt : import your IP settings from location 2 with exec switch
netsh interface ip set address "Local Area Connection" dhcp : automatically obtain an IP address from a DHCP server
netsh interface ip set dns "Local Area Connection" static 192.168.0.200 : configure DNS addresses
netsh interface ip set wins "Local Area Connection" static 192.168.0.200 : configure WINS addresses
netsh interface ip set dns "Local Area Connection" dhcp : dynamically obtain it's DNS settings
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regedit /s ProxyOn.reg :

==== Save as ProxyOn.reg =====
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable"=dword:00000001
"ProxyServer"="localhost:8080"
"ProxyOverride"="<local>"

==== Save as ProxyOff.reg =====
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable"=dword:00000000

linux faq command

nmblookup (Samba) : NetBIOS over TCP/IP client used to lookup NetBIOS names
nbtstat (Microsoft Windows) : Displays protocol statistics and current TCP/IP connections using NBT (NetBIOS over TCP/IP).
reset : Restore a screwed-up terminal (a terminal showing funny characters) to default setting. Use if you tried to "cat" a binary file. You may not be able to see the command as you type it.
lsmod : List currently loaded kernel modules. A module is like a device driver--it provides operating system kernel support for a particular piece of hardware or feature.
modprobe -l |more : List all the modules available for your kernel. The available modules are determined by how your Linux kernel was compliled. Every possible module/feature can be compiled on linux as either "hard wired" (fast, non-removable), "module" (maybe slower, but loaded/removable on demand), or "no" (no support for this feature at all).
insmod parport , insmod ppa : (as root) Insert modules into the kernel (a module is roughly an equivalent of a DOS device driver). This example shows how to insert the modules for support of the external parallel port zip drive (it appears to be a problem to get the external zip drive to work in any other way under RH6.0 ).
rmmod module_name : (as root, not essential). Remove the module module_name from the kernel.
find and replace text in multiple files under Linux (1) : perl -pi~ -e 's/string1/string2/' [files]
find and replace text in multiple files under Linux (2) : find ./ -type f -exec sed 's/string1/string2' {} \;
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iptables faq command

iptables manual : Linux 2.4 Stateful Firewall : IPTABLES
masquerade : iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
transparent proxy : iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j REDIRECT --to-port 3128
multi port : iptables -A OUTPUT -s 127.0.0.1/32 -m multiport -p tcp --sport 25,80,53 -j ACCEPT
forward port : iptables -t nat -A PREROUTING -p tcp --dport 6111 -j DNAT --to 192.168.1.101
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squid faq command

convert time : perl -pe 's/[\d\.]+/localtime($&)/e' /var/log/squid/access.log
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mysql faq command

check and repair of MyISAM tables : myisamchk -r /var/lib/mysql/jazzadmin/smf_log_online.MYI
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bind named faq command

flush dns (linux) : rndc flush , /etc/rc.d/init.d/nscd restart
flush dns (windows) : C:\>ipconfig /flushdns
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cisco router switch faq command

line con 0 : logging synchronous , no ip domain-lookup
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