Labels:text | screenshot | black and white | font OCR: File ax25 These commands are used for AX25 interfaces. With no parameters it will display the AX.25 "heard" list. (see 'ax25 heard') ax25 bc [<interface> ] This command routes BEACON broadcasts via <interface> ax25 bcinterval [<seconds>] Display or set the time interval between BEACON broadcasts. ax25 bctext [<"beacon_text">] Display or set the text to be sent for BEACON broadcasts. ax25 blimit [<count>] Display or set the AX25 retransmission backoff limit. Normally each successive AX25 retransmission is delayed by twice the value of the previous interval; this is called binary exponential back- off. When the backoff reaches the blimit setting it is held at that value, which defaults to 30. To prevent the possibility of "congestive collapse" on a loaded channel, blimit should be set at least as high as the number of stations sharing the channel. Note that this is applicable only on actual AX25 connections; UI frames will never be retransmitted by the AX25 layer. ax25 destlist Displays the destination list: i.e, the addressed-to stations. The display shows latest times of transmission TO stations, together with the times that the station replied (if the destination was out of range the replied field will be blank) ax25 digipeat [onloff] Display or set the digipeater enable flag. ax25 filter [1] | [2] | [3] Display or set the logging of heard lists of source and destination AX25 callsigns. This is a bitwise-OR function where the 01 value is for source stations and the 02 value for destination stations. When the bit is '0', logging is enabled, when '1' it is disabled. ax25 flush Clear the AX.25 "heardlist" and "destlist" (see ax25 heardlist & destlist). ax25 heardlist Display the AX.25 "heard" list. For each interface that is con- figured to use AX.25, a list of all callsigns heard through that interface is shown, along with a count of the number of packets heard from each station and the interval, in hr:min:sec format, since each station was last heard. The local station always appears first in the listing; the packet count actually reflects the number of packets transmitted. This entry is always present even if no packets have been sent. ax25 irtt [<milliseconds>] Display or set the initial value of smoothed round trip time to be used when a new AX25 connection is created. The value is in milliseconds. The actual round trip time will be learned by measurement once the connection has been established. ax25 kick <axcb> Force a retransmission on the specified AX.25 control block. ax25 maxframe [<count>] Establish the maximum number of frames that will be allowed to remain unacknowledged at one time on new AX.25 connections. This number cannot be greater than 7. ax25 mycall [<call>] Display or set the local AX.25 address. The standard format is used (eg. KA9Q-0 or WBGRQN-5) . This command must be given before any attach commands using AX.25 mode are given. ax25 paclen [<size>] Limit the size of I-fields on new AX.25 connections. If IP datagrams or fragments larger than this are transmitted, they will be transparently fragmented at the AX.25 level, sent as a series of I frames, and reassembled back into a complete IP datagram or fragment at the other end of the link. To have any effect on IP datagrams, this parameter should be less than or equal to the MTU of the associated interface. ax25 pthresh [<size>] Display or set the poll threshold to be used for new AX.25 Ver- sion 2 connections. The poll threshold controls retransmission behavior as follows. If the oldest unacknowledged I-frame size is less than the poll threshold, it will be sent with the poll (P) bit set if a timeout occurs. If the oldest unacked I-frame size is equal to or greater than the threshold, then a RR or RNR frame, as appropriate, with the poll bit set will be sent if a timeout occurs. The idea behind the poll threshold is that the extra time needed to send a sma 11" I-frame instead of a supervisory frame when polling after a timeout is small, and since there's a good chance the I-frame will have to be sent anyway (i.e ., if it were lost previously) then you might as well send it as the poll. But if the I-frame is large, send a supervisory (RR/RNR) poll instead to determine first if retransmitting the oldest unacknowledged 1 frame is necessary; the timeout might have been caused by a lost acknowledgement . This is obviously a tradeoff, so experiment with the poll threshold setting. The default is 128 bytes, one half the default value of paclen. ax25 reset <axcb> elete the AX.25 connection control ddress. block at the specified ax25 retry [<count>] Limit the number of successive unsuccessful retransmission attempts on new AX.25 connections. If this limit is exceeded, link re-establishment is attempted. If this fails retry times, then the connection is abandoned and all queued data is deleted. ax25 route Display the AX.25 routing table that specifies the digipeaters to be used in reaching a given station, along with the transmission mode (VC - Virtual Circuit, DG - Datagram or IF - Default). ax25 route add <target> [digis ... ] Add an entry to the AX.25 routing table. An automatic ax25 route add is executed if digipeaters are specified in an AX25 connect command, or if a connection is received from a remote station via digipeaters. Such automatic routing table entries won't override locally created entries, however. ax25 route drop <target> Drop an entry from the AX.25 routing table. ax25 route mode <target> [VC] | [DG] ] [IF] Change the transmission mode for a existing route entry. ax25 status [<axcb>] Without an argument, display a one-line summary of each AX.25 control block. If the address of a particular control block is specified, the contents of that control block are dumped in more detail. Note that the send queue units are frames, while the receive queue units are bytes. ax25 t3 [<milliseconds> ] Display or set the AX.25 idle "keep alive" timer. Value is in illiseconds. ax25 t4 [<milliseconds> ] Display or set the AX.25 "link redundancy" timer. The value is in illiseconds. ax25 timertype [<original l linear lexponential>] ax25 version [1] | [2] Display or set the version of the AX.25 protocol to attempt to use on new connections. The default is 2 (the version that uses the poll/final bits). ax25 window [<size>] Set the number of bytes that can be pending on an AX.25 receive queue beyond which I frames will be answered with RNR (Receiver Not Ready) responses. This presently applies only to suspended interactive AX.25 sessions, since incoming I-frames containing network (IP, NET/ROM) packets are always processed immediately and are not placed on the receive queue. However, when an AX.25 connection carries both interactive and network packet traffic, an RNR generated because of backlogged interactive traffic will
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