For example, to filter all incoming traffic on the interface eth0 , the command to add this rule is: Besides from running the binary, the traffic to optimize must be redirected to the PEPsal interface. User Tools Log In. PEPsal contains several threads to perform the different tasks in parallel. The default route for this table routes all packets to the loopback interface refer to this section for the commands. 
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At application level, an application called pepsalis in charge of accepting the connections on behalf of the original destination, of creating new sockets and establishing a connection with the destination, and of redirecting the traffic between the two endpoints TCP Splitting. The poller thread works with the sockets that the listener has created both endpoints. In the other hand, if no socket is found meaning no connection was established, and that, probably, the segment is a SYNnetfilter redirects the packet to a local port, where a socket is listening for incoming connections.
There exists another thread, called the timer scheduler thread, that runs periodically, checking for pending logs to be displayed on screen or to the log fileand checking if it is time to pepxal the garbage connections collector.
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pepsal:user_manual:index [Net4sat wiki]
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.
In the first case, the sockets are queued to be treated by the worker threads.
First, the listener socket is opened, and then an infinite loop is entered, waiting for incoming connection requests on this socket. Finally, a default route must be added to this new table, telling the kernel to route all packets to the loopback interface: Peppsal this time, it will be considered garbage.
pepsal:design [Net4sat wiki]
In any case, since only TCP traffic is optimized, it is recommended to specify it to avoid unnecessary processing. It does not require modifications on content servers, or satellite receivers, it is sufficient to set it up in a computer traversed by the TCP connections.
This commands tells the kernel to use the routing table numberwhen routing packets with a forwarding mark equal to 1. To instruct the kernel to use a particular routing table not the default for marked packets, run the following command:. Once a 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 pepsxl.
The worker threads are in charge of forwarding the traffic from one endpoint of the proxy to the other. PEPsal works a multi-layer proxy, that works at two levels: Immediately after, a new socket with the original source address is created, and a connection is established with the original destination. For example, pepsao filter all incoming pespal on the interface eth0the command to pepasl this rule is:.
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To instruct the kernel to use a particular routing table not the default for marked packets, run the following command: Netfilter offers various tools for packet filtering, network address translation NATand port translation. 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. It thus effectively splits the TCP connection in two.
These two commands must be configured only one time, since they are valable for all PEPsal traffic. For example, to filter all incoming traffic on the interface eth0the command to add this rule is: 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 and port.
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. PEPsal binary can be run with the following optional parameters: User Tools Log In.
The threads are signaled by the poller when there is data ready to be relayed in at least one proxy.
User Manual
Finally, a default route must be added to this new table, telling the kernel to route all packets to the loopback interface:. In Linux, it is possible to configure the behaviour of the packets e.
To effectively direct these packets to PEPsal, they have to pepwal routed to the local lo interface. In the latter case, the connection on both endpoints will be closed.
This mark will be used to route the packets. On lepsal other hand, any number of iptables rules can be added, to filter any type of traffic.
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