Linux Server and Workstation Configuration How To

1. Internet gateway on FreeBSD

... and somewhere to climb on the lo0 $cmd 030 deny ip from any to 127.0.0.0/8 $cmd 040 deny ip from 127.0.0.0/8 to any # Send all on a transparent squid $cmd 050 fwd 127.0.0.1,3129 tcp from $lannet ...

2. How To Securing SSH Connection

...  Access control tcpwrapper configuration - /etc/hosts.allow and /etc/hosts.deny Choose a strong password Install "DenyHosts" to auto-block bad clients - Installing the "denyhosts" server which ...

3. Creating Transparent Proxy With squid and iptables

... http_access allow clients http_access deny all Add iptables rules iptables -t nat -A PREROUTING -s 192.168.5.0/24 -d ! 192.168.5.1 -p tcp -m multiport --dport 80,81,82,83,88,8000,8001,8002,8080,8081 ...

4. Network Information and Configuration Commands

Configure Network # netconfig Get Network Status # netstat # ifconfig Get Route Information # route Get Network Cards # lspci | grep -i ethernet Dump TCP Packages to View # tcpdump Dump TCP Packages Into ...

5. Default Port Numbers

... it is presently the policy of IANA to assign a single well-known # port number for both TCP and UDP; hence, most entries here have two entries # even if the protocol doesn't support UDP operations.  ...