Part III Using the Command Line in SUSE Linux in .NET

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Part III Using the Command Line in SUSE Linux
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Setting an MTU to 9000 is common on gigabit Ethernet devices, and this is commonly called a jumbo frame. As gigabit Ethernet works a lot faster, it gets to a point where it is not efficient to send data in blocks of 1500 octets as is common with 10- or 100-megabit devices. Setting the MTU to 9000 provides a much more efficient way of transporting data very fast over gigabit Ethernet.
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To view data about your Ethernet device, you can use the show option for the link (network interface) object (see Listing 15-4).
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Listing 15-4: Viewing Information about Your Network Device
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bible:~ # ip link show 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: sit0: <NOARP> mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0 3: eth0: <BROADCAST,MULTICAST,ALLMULTI,UP> mtu 1500 qdisc pfifo_fast qlen 100 link/ether fe:fd:d4:0d:d0:73 brd ff:ff:ff:ff:ff:ff
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As is the case with the output of ifconfig, you are shown the hardware address, MTU, and interface flags. The qdisc entry refers to the queue (or buffer) that is associated with any traffic that is sent over the interface.
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Configuring your network address
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As with the configuration of the network interface, you need to work on a certain network object. To configure the addressing of a network interface, you need to work with the addr (address) object. The ip addr command is similar to ifconfig in what information it needs to configure the address.
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bible:~ # ip addr add 192.168.0.5 dev eth0
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As would be case with ifconfig, you tell ip to edit the address of the device eth0, adding the IP address of 192.168.0.5. We talked about virtual adapters earlier in the chapter, and the configuration with ip is as simple (if not simpler) to configure. If you want your network interface to listen to more than one address, simply use the same format as shown for the initial network address with a different IP. This will add the address to the adapter, which can be viewed using the ip addr show command (see Listing 15-5).
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Listing 15-5: Viewing Network Configuration
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bible:~ # ip addr show 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 brd 127.255.255.255 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever
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15 Linux Networking
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2: sit0: <NOARP> mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0 3: eth0: <BROADCAST,MULTICAST,NOTRAILERS,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:03:ff:69:68:12 brd ff:ff:ff:ff:ff:ff inet 192.168.0.5/24 brd 192.168.0.255 scope global eth0 inet6 fe80::203:ffff:fe69:6812/64 scope link valid_lft forever preferred_lft forever
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Again, as with ifconfig, you are shown the IP address (inet) and broadcast address (brd) of the interfaces.
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Configuring your routing
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Whereas with ifconfig and route, you use separate commands to configure the network and routing, you use the ip command to configure the routing as well. To configure routing, you need to edit the route object. You first add the default route to the Linux system:
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bible:~ # ip route add default via 192.168.0.8
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As you can see, this command is very similar to the way you set the default route using the route command with the exception of specifying the gw portion (which is now via). The iproute suite of applications is just now coming into mainstream use and its operation set is very large and well defined. Take a look at the ip man page for more information about what you can do with the ip command.
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The Wonderful World of ARP
On the level of Ethernet, each station (or node) listens for traffic destined to its physical (MAC) address. In 6, we talked about the layered model of the ISO OSI. This model can help your understanding here because when TCP/IP traffic has been encapsulated into an Ethernet frame, the destination Ethernet address is also added. However, at this level, the IP address does not come into play because this is purely Ethernet-based addressing. So how does the sending machine know what Ethernet address local traffic should have TCP/IP uses Address Resolution Protocol (ARP) to match an IP address to a local (to the network) address. When a machine needs to send data to a machine on its local network, it sends an ARP broadcast asking, Who has the IP address 192.168.0.233 The 192.168.0.233 machine (if alive) will respond saying, I have that IP address, and my MAC address is XYZ. The sender then uses this MAC address as the destination in the Ethernet frame when it needs to send data to the 192.168.0.233 machine. Now, if every time data needs to be sent to 192.168.0.233 the sending host were to do an ARP lookup, this would slow down the transfer of data. To combat this, Linux keeps an ARP cache. This cache contains a lookup table, correlating the IP address to the destination MAC address. To view the ARP table, use the command arp (see Listing 15-6). In the following output, you can see how an IP address is correlated to a MAC address (for example, IP address 192.168.0.1 is associated with MAC (hardware) address 00:00:0F:00:00:01).