Don't see the Linux bridging code as a replacement for switches, but rather as an extension of the Linux networking capabilities. Please note that this code wasn't written with the intent of having Linux boxes take over from dedicated networking hardware.
Either kill them impolitely or learn about omshell(1). If you do this many times, you may end up with lots of dhclient processes. If you want your bridge to automatically get its IP address from the ADSL modem via DHCP (or a similar configuration), do this: Exactly that way you configure it, replacing the previous command with something like: It behaves like one interface (like a normal network card). Optionally you can configure the virtual interface mybridge to take part in your network. This will set the host up as a pure bridge, it will not have an IP address for itself, so it can not be remotely accessed (or hacked) via TCP/IP. The basic setup of a bridge is done like: More details about the options, some discussions and rationale can be found in
These allow the user to control various values related to IGMP snooping. This is the only way to shrink the multicast hash. It must be a power of two and cannot be set to a value less than the current number of multicast group entries. The max setting on the other hand takes effect immediately. At which point it is checked and if after rehashing it still can't be satisfied then snooping will be disabled. The elasticity setting does not take effect until the next new multicast group is added. These settings allow the user to control the hash elasticity/max parameters. if eth0 is some bridge's active port, then you can adjust /sys/…./eth0/brport/multicast_router) Note: this setting can be enabled/disable on a per-port basis, also through sysfs interface (e.g. The default is 1 which lets the system automatically detect the presence of routers (currently this is limited to picking up queries), and 2 means that the ports will always receive all multicast traffic. A port with a multicast router will receive all multicast traffic. This allows the user to forcibly enable/disable ports as having multicast routers attached. If the collisions have not been resolved however the system will refuse to reenable snooping. It also allows the user to reenable snooping when it has been automatically disabled due to hash collisions. This option allows the user to disable IGMP snooping completely. For brN, the settings can be found under /sys/devices/virtual/net/brN/bridge. IGMP snooping support is not yet included in bridge-utils or iproute2, but it can be easily controlled through sysfs interface. If you are running multiple or redundant bridges, then you need to enable the Spanning Tree Protocol ( STP) to handle multiple hops and avoid cyclic routes.įorward delay 150.00 bridge forward delay 15.00ĭesignated root 0000.000480295a00 path cost 100ĭesignated bridge 001e.00048026b901 message age timer 17.84ĭesignated port 80c1 forward delay timer 0.00ĭesignated root 8000.00004c9f0bd2 path cost 100ĭesignated bridge 8000.00004c9f0bd2 message age timer 0.00ĭesignated port 8002 forward delay timer 0.00 Setting ageing time to zero makes all entries permanent. # brctl setageing //bridgename// //time// Normally there should be no need to modify this parameter, but it can be changed with (time is in seconds). The entries in the forwarding database are periodically timed out to ensure they won't stay around forever.
#MODEM VS ROUTER WIKIPEDIA MAC#
The aging time is the number of seconds a MAC address will be kept in the forwarding database after having received a packet from this MAC address. Once a bridge is running the brctl showmacs will show information about network addresses of traffic being forwarded (and the bridge itself). The brctl show command gives you a summary about the overall bridge status, and the instances running as shown below:īridge name bridge id STP enabled interfaces
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