Linux Advanced Routing Tutorial .. [router] ~ # cat /etc/iproute2/rt_tables # # reserved values # local main default 0 unspec. iproute2 is a collection of userspace utilities for controlling and monitoring various aspects of NetEm – Network Emulator · Linux networking commands using iproute2 – Tutorial for configuring IP address, Routing table, Neighbour table etc. IPROUTE2 Utility Suite Howto This docvumentation covers the ip utility from IPROUTE2. This utility is This includes all of the utilities in the IPROUTE2 suite.

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The collection should be installed on any machine where you will be running any of the advanced ip networking functions.

Tunnel tuhorial and other settings on both endpoints must match.

LiNUX Horizon – Linux Advanced Routing mini HOWTO

Show all rules ip rule show ip -6 rule show. If the interface is loopback, the rule matches only packets originated by this host. This is used to connect L2 segments via a routed network. The routing information record contains the data required to deliver IP packets, such as output device and next hop router, and additional optional attributes, such as path MTU or the preferred source address for communicating to that destination.

If you want switching instead of routing, you can bridge those veth interfaces with other interfaces in corresponding namespaces. The difference between the two is:. The natural action is to select the nexthop and output device. Two more commands, prepend and append do exist.

For example, if you assign Alas, this means that this attribute affects only the connection retry rate and is hence useless. You can add network interfaces to a numbered group and perform operations on all the interfaces from that group at once. Because of inconsistencies, as well as halted maintenance, a collection of tools known under the umbrella moniker iproute2 has been used to replace these separate tools.


This Linux -related article is a stub. This option was described in the route 8 man page as borrowed from BSD but was never implemented in Linux. Add a plain route to network Would our rules ever be used?

Additionally you can readily see the scope of the address mask in CIDR notation thus making it easier to see where a route would be a more specific or general set of another route.

iproute2 tutorial for ifconfig, arp, route users

Actually another routing table always exists which is invisible but even more important. View multicast routes Multicast routes cannot be added manually, so this command can only show multicast routes installed by a routing daemon. Next iprotue2 will cover what route tables we will want to create. One harmful exception is the ip link command which may change only part of the device parameters given on the command line.

A much simpler but still very useful application is packet path accounting by realms. The client tag is the tag set by the customer.

iproute2 tutorial for ifconfig, arp, route users – Pratik Sinha

This type of tunnels is commonly used to provide an IPv4-connected network with IPv6 connectivity. We will setup two addresses on our DMZ ethernel interface. Range of use Desktop Embedded Gaming Thin client: However in this specific case it is not recommended that you manually fiddle with default routes but instead use the Router Discovery protocol. If this option is not present, the protocol family output to use is guessed from the other command line arguments. There are so called “tunnel brokers” that provide it to everyone interested, e.

For testing you can add peers manually given remote endpoint uses We will assume that you have obtained the latest package usually called iproute2-current symlinked to the latest dated version.

The table local is the special routing table containing high priority control routes for local and broadcast addresses. The output of this command consists of per route records separated by line feeds. This way you can reassign an interface back to default namespace with e.


In either case with no forwarding we restart router discovery as the final step. Actually, in Linux 2. After the interface name we see the interface mtu maximal transfer unit which determines maximal size of data packet which can be sent as a single packet over this interface.

This type of tunnels allows you to communicate with multiple endpoints by using the same tunnel interface. Category Commons Book Wikiversity Portal.

Within the angle brackets is where the interface flags are summarized. If you list cloned entries the output contains other attributes, which are evaluated during route calculation and updated during route lifetime. N is number in the range If TYPE is omitted, ip assumes type unicast.

To get an overview of the addresses attached to each interface, type ip addr in with no arguments:. First it will be passed through the rule priority 0 which will pass on it.

L2TPv3 is a tunneling protocol commonly used for L2 pseudowires. With Alexey’s permission we have edited and expanded the Latex documentation into the sections found here. We can access this server through that interface, where our own interface address is Now that we understand what this utility provides let us return to the discussion of the ifcfg script.

Where the ip route show command dumps the main IP routing table, ip route iproutr2 prints the help page. Unfortunately, IPv6 currently only understands the append command correctly, all the rest of the set translating to append. Notes There is no way to swap primary and secondary addresses or explicitly set the new primary address.