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When you configure a Linux system as a router, you're setting up a junction between your network and an external network, such as the Internet. The assumption is that the system you're configuring has at least two network cards, and each of the network cards is configured on different networks. Furthermore, when you enable routing, it has to be enabled both in the kernel and in routing tables. Separate steps are required if you're routing on IPv4 and IPv6 addresses. If you want to enable routing in the kernel, you need to enable it in one or both of the first two files. These are Boolean files, in other words, the value is either zero or one. Zero is disabled, one is enabled. For example, this tells me that IPv4 routing is currently disabled in the kernel. The easiest way to enable it into the kernel is with the echo "1" redirect to that file command. And now routing is enabled for IPv4 addressing in the kernel. Similarly for IPv6 addressing, you need to change the Boolean of the associated configuration file. And the same technique works here. IPv6 addressing, includes forwarding in the kernel, but these changes won't survive or reboot unless you add these settings to the etc slash sysctl dot conf file. This enables IPv4 for forwarding, or routing. Forwarding and routing are effectively the same thing. This enables IPv6 forwarding or routing.
| Course: | Red Hat Certified Engineer |
| Author: | Michael Jang |
| SKU: | 33845 |
| ISBN: | 1-934743-47-X |
| Release Date: | 2008-01-18 |
| Duration: | 6.5 hrs / 94 lessons |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |