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ax25rtd.conf: ax25 routing daemon configuration file


ax25rtd.conf - ax25 routing daemon configuration file


The file /etc/ax25/ax25rtd.conf is the configuration file for ax25rtd. The parameters of the options shown here are the default values except the ones marked with (example) ax25-maxroutes 256 ip-maxroutes 256 The maximum size of the three lists / caches. On overflow, ax25rtd will substitute the oldest entry with the new one. [1k2] This marks the beginning of per-port definitions. Note that you have to use port names as defined in axports(5) here, anywhere else you may use the port or the device name. ax25-learn-routes no Set this to "yes", ax25rtd will add the routing information for every heard frame (with complete digipeater path) to the kernel AX.25 routing table. Note that ax25rtd's internal cache will be updated anyway, regardless of this option. ax25-learn-only-mine no If you set it to "yes", only frames that are sent to (1) the interface callsign, (2) any of the listeners on this device, or (3) the callsigns specified by ax25-more-mycalls will be used to update the internal cache and (depending on ax25-learn-routes) the kernel routing table. ax25-add-path db0ach (example) This is useful on DAMA digipeaters. In this case, the DAMA master has to be used for _every_ AX.25 connection, thus ax25rtd will add this digipeater(s) to every target we learn that has no digipeater path (yet). "db0ach" is just an example here. ax25-more-mycalls dl1bke dl1bke-8 (example) You can specify more calls as calls here that belong to this interface... "dl1bke" and "dl1bke-8" are examples. ip-learn-routes no If set to "yes", ax25rtd will modify the IP routing table if it receives an IP frame (directed to us). This is dangerous! It should not screw up your routing table, though. Ax25rtd recognizes the netmask of the device and will adjust the route only if it fits the netmask and the old route points to one of the devices ax25rtd knows about (hence an AX.25 device). The problems begin if you have more than one port and a user is able to hear your outgoing traffic on at least two of them. Due to technical reasons ax25rtd adjusts the route _after_ the kernel has sent the reply to the received TCP frame already. This has technical reasons. If the remote does the same both are switching between the two ports. Don't use this feature unless you know what you are doing. It _should_ be safe do enable this on one-port machines, although I strongly recommend to set a network route instead, i.e.: route add -net scc3 Note that ax25rtd's internal cache will be updated anyway, regardless of this option. irtt <irtt> If ip-learn-routes is enabled this will assign newly added routes an initial round trip time (IRTT) for TCP. <irtt> is measured in msec, hence irtt 10000 sets the irtt to 10 seconds. A value of 0 disables this feature (default). ip-adjust-mode no If you set this option to "yes" ax25rtd will change the IP encapsulation mode according to the last received IP frame. The problem with this option is that the kernel AX.25 sends a received IP frame to the IP layer regardless if it was sent in UI frame encapsulation "mode datagram (dg)" or in I frame encaps, hence in an AX.25 connection, "mode virtual connect (vc)". The Linux kernel will respond to this frame before ax25rtd can adjust the mode. If the remote does the same... You get the picture. Don't use this feature unless you know what you are doing. arp-add no This option, if set to "yes", changes the ARP table to the source callsign of the received frame. It should be harmless, just has the the effect that if it is a new entry, the Linux ARP code will send one ARP request before ax25rtd has adjust the ARP table. If there was already an existing ARP entry for this IP route, one IP datagram will be sent to the old address. Not really a problem, I hope.
ax25rtd(8), ax25rtctl(8).


Jorg Reuter <jreuter@poboxes.com> Llaus Kudielka OE1KIB AX25RTD.CONF(5)

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