Assume you do not have curl/telnet/netcat (or nc does not support -z as in later versions ?? why did they remove it ?? ) the following will work on any recent Bash version. (echo > /dev/tcp/skinner/22) >/dev/null 2>&1 && echo “Port is open” || echo “Port is closed” nJoy 😉
iptables -A INPUT -p tcp –syn –dport 80 -m connlimit –connlimit-above 15 –connlimit-mask 32 -j REJECT –reject-with tcp-reset
In file named after the interface you want to use as gateway: e.g. /etc/sysconfig/network-scripts/route-eth0 Create entries : ADDRESS=192.168.4.0 NETMASK=255.255.255.0 GATEWAY=192.168.1.250 NnJoy 🙂
Just a note to myself really ! route add -p 192.168.4.0 mask 255.255.255.0 192.168.1.250 metric 2
rsync –progress -ah –remove-sent-files –bwlimit=1000 source/ /target nJoy 🙂
This is a Script that I use to deploy and script iptables. Sample handles ssh and mysql it’s easy to extend. #!/bin/bash # # iptables example configuration script # # Flush all current rules from iptables # iptables -F # # Allow SSH connections on tcp port 22 # This is essential when working on…
This is the simple case where all we have is one disk that needs cloning. Assumptions for the following example Tools including backtrack distro available and permissible by company policy ( some c**ts get all agitated when sysadmins use a ‘knife’ to cut the ‘bread’ so be warned) Networking in place for the transfer preferable…
Listing the mac addresses of nic cards excluding null or loopback MACs i.e. 00:00:00:00:00:00 grep -H . /sys/class/net/*/address | awk ‘{split($0,array,”address:”);print array[2]}’ | grep -v ’00:00:00:00:00:00′
DisplayFilters Wireshark uses display filters for general packet filtering while viewing and for its ColoringRules. The basics and the syntax of the display filters are described in the User’s Guide. The master list of display filter protocol fields can be found in the display filter reference. If you need a display filter for a specific protocol, have a look for…
Edit /etc/sysconfig/network and set “NETWORKING_IPV6” to “no” For 5.4 and later, replace in /etc/modprobe.conf alias ipv6 off by options ipv6 disable=1 Alternative (which might be easier and works on any release with /etc/modprobe.d): # touch /etc/modprobe.d/disable-ipv6.conf # echo "install ipv6 /bin/true" >> /etc/modprobe.d/disable-ipv6.conf For CentOS 5.3 or older, add the following to /etc/modprobe.conf :…
