21 of the Best Free Linux Text Editors and 42 of the Best Free Linux Scientific Software (Read more)
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shd-tcp-tools shd-tcp-tools is a set of TCP network tools that supports port forwarding, network load balancing, rate limiting, and running servers behind firewalls. new Autotunnel Autotunnel is a small program for setting up ipip-tunnel automatically. BlockSSHD BlockSSHD protects computers from SSH brute force attacks by dynamically blocking IP addresses by adding iptables rules. brip brip is a tool that performs bulk or stream resolution of IP addresses and hostnames, in any combination. It can read from STDIN, the command line, or a file. clusterit clusterit is a collection of clustering tools, to turn your ordinary everyday pile of UNIX workstations into a speedy parallel beast. Expiretable Expiretable is a utility for removing entries from a pf table based on the age of the entries. This, among other things, can be used with a pf overload table to build a maintenance-free SSH brute force blocker. Fake Fake allows you to take over the IP address of another machine in the LAN by bringing up an additional interface and making use of ARP spoofing. fixsrcip fixsrcip is a tool for binding outgoing TCP and UDP client sockets (IPv4) to specific source IP addresses on multi-homed hosts. Gip Internet Protocol Calculator Gip is an IP address calculator that integrates well with the GNOME desktop environment. Gip provides system administrators with tools for IP address based calculations. grepcidr grepcidr can be used to filter a list of IP addresses against one or more Classless Inter-Domain Routing (CIDR) specifications, or arbitrary networks specified by an address range. As with grep, there are options to invert matching and load patterns from a file. Hostinfo Hostinfo is a utility for looking up hostnames and IP(v4) addresses. Hostinfo uses the gethostbyname and getaddrbyname function calls. HTTPTunnel This is a small application for tunnelling an arbitrary TCP socket connection over HTTP. It can be used, for example, to tunnel traffic out from behind a restrictive firewall that only allows outgoing HTTP web connections. IP Sentinel IP Sentinel tries to prevent unauthorized usage of IPs within the local ethernet broadcastdomain by giving an answer to ARP-requests. After receiving such a faked reply, the requesting party stores the told MAC in its ARP-table and will send future packets to this MAC. ipac-ng ipac-ng is an ip accounting package for linux. It collects, summarizes and nicely displays ip accounting data. ipcalc ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. iproute2 Iproute2 is the name of a collection of utilites for controlling TCP / IP networking and Traffic Control. iptoip iptoip maintains an ipvsadm table coherent. It is specially useful when using an intermittent internet conection or when your ISP breaks conections to reaffect IP adresses. LCDNetstat LCDNetstat displays the TCP/IP connections of a computer on a external LCD screen. Local IP Takeover Local IP Takeover provides network link redundancy within a single server that has multiple network interface cards (NICs) with each NIC connected to separate network switches. MAC Changer MAC Changer is a utility for viewing/manipulating the MAC address of network interfaces. myipsitestatus myipsitestatus is a set of bash scripts that maintains a status display for a dynamic IP. Network Tracker Network Tracker builds a table which records which user is connected on which port of a switch by scanning SNMP-enabled devices. NorthStar NorthStar is a system to help track and allocate IP Addresses in an IP Network. Paketto Keiretsu Paketto Keiretsu is a collection of tools that use new and unusual strategies for manipulating TCP/IP networks. They tap functionality within existing infrastructure and stretch protocols beyond what they were originally intended for. Program Guard Program Guard allows the user of a Linux workstation to specify which application programs that are allowed TCP/IP connections to the Internet (Internet addresses are defined as any IP address not in the range of 10.0.0.0/24 or 192.168.0.0/16). pySortNet pySortNet sorts IP addresses (IPv4 and IPv6) and hostnames given on standard input such that addresses and names are grouped in logical groups. SendIP SendIP is a command line tool to allow sending arbitrary IP packets. sipcalc sipcalc is an ip subnet calculator that currently comes in two versions. A console version and a web (cgi) version. StdioTunnel StdioTunnel allows you to tunnel arbitrary TCP connections through any connection that approximates a tty with a clear 8-bit data path. In this sense it provides the same kind of functionality as ppp, but for a limited, fixed set of connections. Stone TCP/IP packet repeater Stone is a TCP/IP repeater in the application layer. It repeats TCP and UDP from inside to outside of a firewall, or from outside to inside. Tableutil Tableutil is a utility for converting, aggregating and performing operations (currently unions, differences, complements and intersections) on lists of IP-addresses. Its primary use is to convert files into a format pfctl can read, but if you find another use for it TCP/IP Connection Cutter TCP/IP Connection Cutter allows network administrators to close TCP/IP connections running over a Linux/iptables firewall. TN3270RG TN3270RG is a TCP/IP TN3270 gateway that dynamically assigns resources to a connection from a pool of available addresses. Features include an easy to use web interface for management and a PostgreSQL database backend. trafcalc trafcalc calculates the size of the tcp-payload on a system via packet capturing and connection tracking at the user level instead of the ip level. Transparent Mobile IP Transparent Mobile IP aims to provide IP mobility across multiple networks, ensuring that all active TCP sessions will be maintained upon migration. TRIPP TRIPP is a utility to rewrite incoming and outgoing IP packets. Since it can rewrite both headers and payload, it can be used to configure the TCP/IP stack behavior in order to perform various tasks mainly intended for network tests, simulations, and development. It is configured via a small rule-based language, which allows the user to intercept packets, set arbitrary header values, increment or decrement numeric header fields, set an arbitrary payload, rewrite parts of the payload, or fragment, delay, multiply, or drop packets. ttmap ttmap passively analyzes values of TCP Timestamps in captured IP packets. After collecting enough data, it computes characteristic remote machine parameters. These values let it guess remote operating systems and identify unique machines behind a single IP address. For example, it can analyze remote IP load-balanced clusters. UCARP UCARP allows a couple of hosts to share common virtual IP addresses in order to provide automatic failover. It is a portable userland implementation of the secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD?s alternative to the patents-bloated VRRP). ULN User Level Networking is software designed to allow the dynamic allocation of IP addresses. The basic idea is to give different IP addresses to different users, thus identifyng the couple UID-HOST with just the IP address. ViperTracker ViperTracker lets any kind of server using any protocol update their IP address on ViperTracker. Whatmask Whatmask is a small C program that lets you easily convert between three common subnet mask notations.
