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To effectively direct these packets to PEPsal, they have to be routed to the local lo interface. User Tools Log In. For example, to filter all incoming traffic on the interface eth0 , the command to add this rule is: The work of the listener ends here, since all subsequent packets pertaining to these connections will not be redirected the listener port. Manage book 0 page s.

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This mark will be used to route the packets.

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There exists another thread, called the timer scheduler thread, that runs periodically, checking for pending logs to be displayed on screen prpsal to the log fileand checking if it is time to call the garbage connections collector. Table of Contents PEPsal design.

Since the packets must not exit the machine, but be redirected to the local sockets, they must be routed to the loopback interface. User Tools Log In.

It thus effectively splits the TCP connection ;epsal two. Except where otherwise noted, content on this wiki is licensed under the following license: For more details, here is: In the latter case, the connection on both endpoints will be closed. In order to facilitate the iptables configuration, another binary is distributed with pepsal, pepsal-iptablesthat allows to easily set iptables rules, along with the pertinent ip routes.

A signal is sent to the poller thread, for it to watch the events that are triggered on them. The default route for this table routes all packets to the loopback interface refer to this section for the commands.

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pepsal:design [Net4sat wiki]

For a more detailed description, refer to PEPsal design. PEPsal represents a valid solution for the degraded TCP performance when satellite links are involved. In the first case, the sockets are queued to be treated by the worker threads. If a socket is found, that means that a transparent proxy is already established, and thus, redirects this packet to said socket. When the connections are effectively established, an event of type CONNECTED is detected, and the connections are considered as open moment at which, buffers are created in order to temporarily store the relayed data.

Once pepwal connection request is intercepted redirected by the TPROXY target that was unable to find a matching socketthe connection is accepted on behalf of the remote host, and a new socket is created, bound to the original source address.

PEPsal works a multi-layer proxy, that works at two levels: In order to not interfere with the routing of all the other packets not affected by PEPsal, a different routing table than the default one is used for marked packets. This redirection is done by netfilterand can be configured by using the tool iptables. This file contains variables for all the parameters already described.

User Manual

Besides the iptables rule, in order to locally route the packets to the PEP socket, a mark is used on all packets that match the rules added. The workers will continue to work until there are no more items in the active queue, and then will wait for a new signal by the poller. Incoming packets are usually handled by the kernel, and are not accessible to the user to modify.

All subsequent traffic corresponding to any of these two connections is affected by the same rule in iptables, and will be redirected to the corresponding sockets since now, netfilter will be able to find one with the same destination address pepal port.

pepsal:index [Net4sat wiki]

If these packets are SYN segments establishing a new connection, PEPsal accepts the connection on behalf of the destination, pesal creates new socket that connects to it, splitting in two the connection. First, the listener socket is opened, and then an infinite loop is entered, waiting for incoming connection requests on this socket. Once opened, the events that can be detected are the reception of data segments, or the end of lepsal connection.

This target receives two parameters: If the packets received by PEPsal are data segments, then they are copied between the endpoints, to relay the information from one host to another. By default, PEPsal will be launched as a service, running the pepsal binary as a daemon.

User Tools Log In. In this case, this port is that of PEPsal, which is listening for new connections.