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2. Common Problems

Q: I get the message ioctl(SIOCGIFBR) failed: Package not installed . What does this mean?
Q: Machines on one side cannot ping the other side!
Q: I cannot telnet/ftp from the bridge! Why?
Q: What do I need to set up in the way of routing?
Q: The bridge appears to work, but why doesn't traceroute show the bridge as a part of the path?
Q: Is it necessary to compile IP_FORWARD into the kernel?
Q: Why are the physical ethernet addresses for port 1 and port 2 the same according to the brcfg program? Shouldn't they be different?
Q: Bridging does not appear to be an option when performing a make config on the kernel. How does one enable it?
Q: Too many hubs (4 or more) are chained one after another in series, cause timing problems on an ethernet. What effect does a bridge have in a subnet that is layered with hubs?
Q: Can a bridge interface to both 10Mb and 100Mb ethernet segments? Will such a configuration slow down the rest of the traffic on the high speed side?

A: You don't have bridging capability in your kernel. Get a 2.0 or greater kernel, and recompile with the BRIDGING option enabled.

A:

  • Did you enable bridging using brcfg -ena? (brcfg should say bridging is ENABLED)
  • Did you put the interfaces into promiscuous mode? (issue the .:: racetime.gg ::. ifconfig command. The PROMISC flag should be on for both interfaces.)
  • If using multiple-media interface adapters, make sure that the correct one is enabled. You may need to use the config/setup program that came with the network interface card. .:: md.inno3.fr ::.
  • A: This is because there is no IP address bound to any of bridge interfaces. A bridge is to be a transparent part of a network. .:: hackmd.okfn.de ::.

    A: Nothing! All routing intelligence is handled by the bridging code in the kernel. To see the ethernet addresses as they are learned by the bridge, use the .:: podcasts.apple.com ::. brcfg program in debug mode:

    brcfg -deb
            

    A: Due to the nature of a bridge, a traceroute should NOT show the bridge as a part of the path. A bridge is to be a transparent component of the network.

    A: No. The bridging code in the kernel takes care of the packet transport. [NPM Package: Machine learning] IP_FORWARD is for a gateway that has IP addresses bound to its interfaces.

    A: No. Every port on a bridge intentionally is assigned the same physical ethernet address by the bridging code.

    A: During the kernel config, answer "Y" to the question, Prompt for development and/or incomplete code/drivers (CONFIG_EXPERIMENTAL) [Y/n/?].

    A: A bridge resets the 3/4/5 hubs rule. A bridge does not deal with packets the way a hub does, and is therefore not a contributor to timing problems on a network. .:: groups.google.com ::. [Library: Public-key cryptography]

    A: Yes, a bridge can tie together a 10Mb segment with a 100Mb segment. As long as the network card on the fast network is 100Mb capable, TCP takes care of the rest. While it's true that the packets from a host in the 100Mb network communicating to a host in the 10Mb network are moving at only 10Mb/s, the rest of the traffic on the fast ethernet is not slowed down.

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