As a command-line driven utility, Nemesis is perfect for automation and scripting.
Nemesis can natively craft and inject ARP, DNS, ETHERNET, ICMP, IGMP, IP, OSPF, RIP, TCP and UDP packets.
tcpdump is able to examine IPv4, ICMPv4, IPv6, ICMPv6, UDP, TCP, SNMP, AFS BGP, RIP, PIM, DVMRP, IGMP, SMB, OSPF, NFS and many other packet types.
It can be used to print out the headers of packets on a network interface, filter packets that match a certain expression.
Install Kismet in ubuntu sudo aptitude install kismet 6) Chkrootkit -- Checks for signs of rootkits on the local system chkrootkit identifies whether the target computer is infected with a rootkit. It can be used to encrypt data and to create digital signatures.Nessus scanners can be distributed throughout an entire enterprise, inside DMZs, and across physically separate networks.Install nessus in ubuntu sudo aptitude install nessus 3) Nmap -- The Network Mapper Nmap ("Network Mapper") is a free and open source (license) utility for network exploration or security auditing. Please note that this is not a definitive test, it does not ensure that the target has not been cracked.Some of the rootkits that chkrootkit identifies are: 1. It includes an advanced key management facility and is compliant with the proposed Open PGP Internet standard as described in RFC2440.Gnu PG does not use any patented algorithms so it cannot be compatible with PGP2 because it uses IDEA (which is patented worldwide).