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- PACKET-ACCESS FROM DB8AS 27.08.87 02:16 UTC 2501 Bytes
- ROUTING
- *** Received from DK0AUG ***
- R:870823-2221z <DB8AS @DK0AUG #650 [Goettingen, JO41XM]
- Msg # 3595 Type:B Stat:$ To: ALLE @ALLE From: DB0CZ Date: 23-Aug/0530
- Subject: NET/ROM Routing Tables
- Bulletin ID: DB0CZ8708196
- Path: DL5UY !DB0CZ
-
- Copied from a local BBS:
- ------------------------
-
- R:860813/2036 @:WD6CMU Richmond CA #:1694 O:K1HTV F:145.09/223.58
- R:870814/0049z @:W0RLI Santa Cruz, CA #:7572 O:K1HTV
- R:870807/0350z @:W3IWI #9091 <K1HTV [Balto/Wash]
-
- NET/ROM SYSOP NOTE.002
-
- Manual routing table setup
- ----------------------------
-
- Over the past few months I've had the good fortune to connect to
- NET/ROM nodes in 18 stas in this rapidly expanding Packet Radio
- network. In checking the routing tables I've noticed a few common
- sysop errors. At some nodes it is necessart to manually lock in a
- path and override NET/ROM's automatic routing mechanism. It appears
- that some sysops don't completely understand the proper way to
- manually set the NODES table.
-
- One of the most common errors appears to result in the wrong call sign
- being set as the "neighbor" node when manually setting the routing
- table. The call sign of your node should NEVER be entered as the
- neighboring node.
-
- If there is a poor or non-existant direct path between your node and a
- distant node, you may wish to manually lock in the routing table a
- path via a Level 2 digipeater. Your node will assign, to every node
- it hears directly, a Quality Count as determined by Parameter #3 (192
- for 1200 baud HDLC user-accessed channel). Since we are establishing
- a link to a distant node via a digipeater the quality of that routing
- table entry should be set to (143), a value LESS than the quality
- count for that of an intermediate NET/ROM node path (144). If the
- band should open this will ensure that the direct path will take
- precedence followed by a path through an intermediate NET/ROM node.
-
- Example using a Level 2 digi from W1AAA (CONN) to W3CCC (DEL) via W2BBB:
-
- The W1AAA NET/ROM node sysop types: N W3CCC + DEL 143 0 0 W3CCC W2BBB
- The W3CCC NET/ROM node sysop types: N W1AAA + CONN 143 0 0 W1AAA W2BBB
-
- We hope this information will be of some help to NET/ROM sysops.
- 73, Rich - K1HTV & Andy - KA1GD
- (UMD, ELK & BWI sysops)
-
- -----------------------
- Roy Engehausen -- AA4RE
- --------------------------------------------
- *** appended by DG3SAJ @ DB0CZ , 19.8.87 ***
-
-
-
-
- PACKET-ACCESS FROM DC4OX 01.09.87 09:44 UTC 3264 Bytes
- V1.0 -> V1.1
-
-
- =========================================
- NET/ROM version 1.1 released 10 July 1987
- =========================================
-
- Version 1.1 incorporates no new features, but corrects three
- relatively minor problems that were found in version 1.0. We do not
- feel that it is necessary to update nodes presently running 1.0,
- except for the relatively few places where one or more of these
- problems are causing significant difficulty.
-
- Following is a description of the three problems fixed in 1.1:
-
- (1) Destination table entry counter:
- When a destination node is deleted from the routing table
- (either manually or by the automatic obsolescense mechanism),
- the destination list entry is not deallocated immediately,
- but rather just marked as a deleted destination entry
- available for re-use. However, such deleted entries are
- deallocated when the node is warm-started (for example, if
- there is a power failure, or if the SYSOP issues a RESET).
- Version 1.0 has a "bug" whereby the destination table entry
- counter is not decremented when entries are deallocated
- during a warm-start. This can cause the count to become
- incorrect (too large). The count is used to limit the size
- of the destination table in accordance with PARMS parameter
- #1. Consequently, the "bug" can result in premature "Routing
- table full" messages, or failure to incorporate new nodes
- from a neighbor node's routing broadcast. WORKAROUND: this
- problem can be avoided either by (1) not warm-starting the
- node, or (2) setting the PARMS parameter #1 to a high value.
-
- (2) RNR during deferred disconnect
- When two stations are connected via NET/ROM and one of them
- disconnects, NET/ROM's "deferred disconnect" logic causes any
- in-transit information frames to be delivered to the still-
- connected station until all such frames have been delivered
- or until a given period of time elapses (by default, 15
- minutes) with no forward progress. Version 1.0 has a "bug"
- that causes this protective timeout to be ineffective if the
- connected station's TNC is refusing the information by
- returning a RNR status.
-
- (3) Fast-learn of paths with two digipeats
- NET/ROM incorporates new nodes into its routing table by
- monitoring the source callsign field in the layer 3 header.
- Version 1.0 has a "bug" whereby layer 3 frames that arrive
- via two digipeats cause a routing table entry to be
- constructed with the digipeater list in reverse order.
- Version 1.1 fixes this problem, and checks for the existence
- of the entire path, not just the source callsign.
-
- Clearly, these are rather esoteric problems, and have not caused
- significant operational problems. We do not feel that any wholesale
- updating of 1.0 nodes to 1.1 is warranted. However, NET/ROM owners
- may, if they wish, obtain an updated ROM by completing the order form
- in ... (Preisangaben etc. geloescht, DC4OX).
-
- -----------------------
- Roy Engehausen -- AA4RE
- --------------------------------------------
- *** appended by DG3SAJ @ DB0CZ , 19.8.87 ***
-
- hsf DC4OX @ DF3AV
-