- 21 => 8,
- },
-};
-</verb></tscreen>
-
-<P>
-Each set of hops is contained within a pair of curly braces and contains a
-series of PC frame types. PC11 for example is a DX spot. The figures here
-are not exhaustive but should give you a good idea of how the file works.
-
-<P>
-You can alter this file at any time, including whilst the cluster is running.
-If you alter the file during runtime, the command <em>load/hops</em> will
-bring your changes into effect.
-
-<sect1>Isolating networks
-
-<P>
-It is possible to isolate networks from each other on a "gateway" node using the
- <em>set/isolate <node_call></em> command.
-
-<P>
-The effect of this is to partition an isolated network completely from another
-nodes connected to your node. Your node will appear on and otherwise behave
-normally on every network to which you are connected, but data from an isolated
-network will not cross onto any other network or vice versa. However all the
-spot, announce and WWV traffic and personal messages will still be handled
-locally (because you are a real node on all connected networks), that is locally
-connected users will appear on all networks and will be able to access and
-receive information from all networks transparently. All routed messages will
-be sent as normal, so if a user on one network knows that you are a gateway for
-another network, he can still still send a talk/announce etc message via your
-node and it will be routed across.
-
-<P>
-The only limitation currently is that non-private messages cannot be passed down
-isolated links regardless of whether they are generated locally. This will change
-when the bulletin routing facility is added.
-
-<P>
-If you use isolate on a node connection you will continue to receive all
-information from the isolated partner, however you will not pass any information
-back to the isolated node. There are times when you would like to forward only
-spots across a link (maybe during a contest for example). To do this, isolate
-the node in the normal way and put in a filter in the /spider/filter/spots
-directory to override the isolate. This filter can be very simple and consists
-of just one line ....
-
-<tscreen><verb>
-$in = [
- [ 1, 0, 'd', 0, 3] # The last figure (3) is the hop count
-];
-</verb></tscreen>
-
-<P>
-There is a lot more on filtering in the next section.
-
-<sect>Filtering (Old Style upto v1.44)
-
-<P>
-Filters can be set for spots, announcements and WWV. You will find the
-directories for these under /spider/filter. You will find some examples in
-the directories with the suffix <em>.issue</em>. There are two types of
-filter, one for incoming information and one for outgoing information.
-Outgoing filters are in the form <em>CALLSIGN.pl</em> and incoming filters
-are in the form <em>in_CALLSIGN.pl</em>. Filters can be set for both nodes
-and users.
-
-<P>
-All filters work in basically the same way. There are several elements
-delimited by commas. There can be many lines in the filter and they are
-read from the top by the program. When writing a filter you need to think
-carefully about just what you want to achieve. You are either going to write
-a filter to <em>accept</em> or to <em>reject</em>. Think of a filter as
-having 2 main elements. For a reject filter, you would have a line or multiple
-lines rejecting the things you do not wish to receive and then a default line
-accepting everything else that is not included in the filter. Likewise, for an
-accept filter, you would have a line or multiple lines accepting the things you
-wish to receive and a default line rejecting everthing else.
-
-<P>
-In the example below, a user requires a filter that would only return SSB spots
-posted in Europe on the HF bands. This is achieved by first rejecting the CW
-section of each HF band and rejecting all of VHF, UHF etc based on frequency.
-Secondly, a filter rule is set based on CQ zones to only accept spots posted in
-Europe. Lastly, a default filter rule is set to reject anything outside the filter.
-
-<tscreen><verb>
-$in = [
- [ 0, 0, 'r', # reject all CW spots
- [
- 1800.0, 1850.0,
- 3500.0, 3600.0,
- 7000.0, 7040.0,
- 14000.0, 14100.0,
- 18068.0, 18110.0,
- 21000.0, 21150.0,
- 24890.0, 24930.0,
- 28000.0, 28180.0,
- 30000.0, 49000000000.0,
- ] ,1 ],
- [ 1, 11, 'n', [ 14, 15, 16, 20, 33, ], 15 ], #accept EU
- [ 0, 0, 'd', 0, 1 ], # 1 = want, 'd' = everything else
-];
-</verb></tscreen>
-
-<P>
-The actual elements of each filter are described more fully in the following
-sections.
-
-<sect1>Spots
-
-<P>
-The elements of the Spot filter are ....
-
-<tscreen><verb>
-[action, field_no, sort, possible_values, hops]
-</verb></tscreen>
-
-<P>
-There are 3 elements here to look at. Firstly, the action element. This is
-very simple and only 2 possible states exist, accept (1) or drop (0).
-
-<P>
-The second element is the field_no. There are 13 possiblities to choose from
-here ....
-
-<tscreen><verb>
- 0 = frequency
- 1 = call
- 2 = date in unix format
- 3 = comment
- 4 = spotter
- 5 = spotted dxcc country
- 6 = spotter's dxcc country
- 7 = origin
- 8 = spotted itu
- 9 = spotted cq
- 10 = spotter's itu
- 11 = spotter's cq
- 12 = callsign of the channel on which the spot has appeared
-</verb></tscreen>
-
-<P>
-The third element tells us what to expect in the fourth element. There are
-4 possibilities ....
-
-<tscreen><verb>
- n - numeric list of numbers e.g. [ 1,2,3 ]
- r - ranges of pairs of numbers e.g. between 2 and 4 or 10 to 17 - [ 2,4, 10,17 ]
- a - an alphanumeric regex
- d - the default rule
-</verb></tscreen>
-
-<P>
-The fifth element is simply the hops to set in this filter. This would only
-be used if the filter was for a node of course and overrides the hop count in
-hop_table.pl.
-
-<P>
-So, let's look at an example spot filter. It does not matter in the example
-who the filter is to be used for. So, what do we need in the filter? We need
-to filter the spots the user/node requires and also set a default rule for
-anything else outside the filter. Below is a simple filter that stops spots
-arriving from outside Europe.
-
-<tscreen><verb>$in = [
- [ 0, 4, 'a', '^(K|N|A|W|VE|VA|J)'], # 0 = drop, 'a' = alphanumeric
- [ 1, 0, 'd', 0, 1 ], # 1 = want, 'd' = everything else
- ];
-</verb></tscreen>
-
-<P>
-So the filter is wrapped in between a pair of square brackets. This tells
-Spider to look in between these limits. Then each line is contained within
-its own square brackets and ends with a comma. Lets look carefully at the first
-line. The first element is 0 (drop). Therefore anything we put on this line
-will not be accepted. The next element is 4. This means we are filtering by
-the spotter. The third element is the letter "a" which tells the program to
-expect an alphanumeric expression in the fourth element. The fourth element
-is a list of letters separated by the pipe symbol.
-
-<P>
-What this line does is tell the program to drop any spots posted by anyone in
-the USA, Canada or Japan.
-
-<P>
-The second line is the default rule for anything else. The "d" tells us this
-and the line simply reads... accept anything else.
-
-<P>
-You can add as many lines as you need to complete the filter but if there are
-several lines of the same type it is neater to enclose them all as one line.
-An example of this is where specific bands are set. We could write this like
-this ....
-
-<tscreen><verb>
-[ 0,0,'r',[1800.0, 2000.0], 1],
-[ 0,0,'r',[10100.0, 10150.0], 1],
-[ 0,0,'r',[14000.0, 14350.0], 1],
-[ 0,0,'r',[18000.0, 18200.0], 1],
-</verb></tscreen>
-
-<P>
-But the line below achieves the same thing and is more efficient ....
-
-<tscreen><verb>
- [ 0, 0, 'r',
- [
- 1800.0, 2000.0, # top band
- 10100.0, 10150.0, # WARC
- 14000.0, 14350.0, # 20m
- 18000.0, 18200.0, # WARC
- [ ,1 ],
-</verb></tscreen>
-
-
-<sect1>Announcements
-
-<P>
-<tscreen><verb>
-
-# This is an example announce or filter allowing only West EU announces
-#
-# The element list is:-
-# 0 - callsign of announcer
-# 1 - destination * = all, <callsign> = routed to the node
-# 2 - text
-# 3 - * - sysop, <some text> - special list eg 6MUK, ' ', normal announce
-# 4 - origin
-# 5 - 0 - announce, 1 - wx
-# 6 - channel callsign (the interface from which this spot came)
-
-$in = [
- [ 1, 0, 'a', '^(P[ABCDE]|DK0WCY|G|M|2|EI|F|ON)' ],
- [ 0, 0, 'd', 0 ]
-];
-</verb></tscreen>
-
-In this example, only the prefixes listed will be allowed. It is possible to
-be quite specific. The Dutch prefix "P" is followed by several secondary
-identifiers which are allowed. So, in the example, "PA" or "PE" would be ok
-but not "PG". It is even possible to allow information from a single callsign.
-In the example this is DK0WCY, to allow the posting of his Aurora Beacon.
-
-<sect1>WWV
-
-<P>
-<tscreen><verb>
-
-# This is an example WWV filter
-#
-# The element list is:-
-# 0 - nominal unix date of spot (ie the day + hour:13)
-# 1 - the hour
-# 2 - SFI
-# 3 - K
-# 4 - I
-# 5 - text
-# 6 - spotter
-# 7 - origin
-# 8 - incoming interface callsign
-
-# this one doesn't filter, it just sets the hop count to 6 and is
-# used mainly just to override any isolation from WWV coming from
-# the internet.
-
-$in = [
- [ 1, 0, 'd', 0, 6 ]
-];
-
-</verb></tscreen>
-
-<P>
-It should be noted that the filter will start to be used only once a user/node
-has logged out and back in again.
-<P>
-I am not going to spend any more time on these filters now as they will become
-more "comprehensive" in the near future.
-
-<sect>Filtering (New Style v1.45 and later)
-
-<sect1>General filter rules
-
-<P>
-Upto v1.44 it was not possible for the user to set their own filters. From
-v1.45 though that has all changed. It is now possible to set filters for just
-about anything you wish. If you have just updated from an older version of
-DXSpider you will need to update your new filters. You do not need to do
-anything with your old filters, they will be renamed as you update.
-
-<P>
-There are 3 basic commands involved in setting and manipulating filters. These
-are <em>accept</em>, <em>reject</em> and <em>clear</em>. First we will look
-generally at filtering. There are a number of things you can filter in the
-DXSpider system. They all use the same general mechanism.
-
-<P>
-In general terms you can create a 'reject' or an 'accept' filter which can have
-up to 10 lines in it. You do this using, for example ...
-
-<tscreen><verb>
-accept/spots .....
-reject/spots .....
-</verb></tscreen>
-
-where ..... are the specific commands for that type of filter. There are filters
-for spots, wwv, announce, wcy and (for sysops) connects. See each different
-accept or reject command reference for more details.
-
-There is also a command to clear out one or more lines in a filter. They are ...
-
-<tscreen><verb>
-clear/spots 1
-clear/spots all
-</verb></tscreen>
-
-There is clear/xxxx command for each type of filter.
-
-<P>
-and you can check that your filters have worked by the command ...
-
-<tscreen><verb>
-show/filter
-</verb></tscreen>
-
-<P>
-For now we are going to use spots for the examples, but you can apply the same
-principles to all types of filter.
-
-<sect1>Types of filter
-
-<P>
-There are two main types of filter, <em>accept</em> or <em>reject</em>. You
-can use either to achieve the result you want dependent on your own preference
-and which is more simple to do. It is pointless writing 8 lines of reject
-filters when 1 accept filter would do the same thing! Each filter has 10
-lines (of any length) which are tried in order. If a line matches then the
-action you have specified is taken (ie reject means ignore it and accept
-means take it)
-
-<P>
-If you specify reject filters, then any lines that arrive that match the filter
-will be dumped but all else will be accepted. If you use an accept filter,
-then ONLY the lines in the filter will be accepted and all else will be dumped.
-For example if you have a single line <em>accept</em> filter ...
-
-<tscreen><verb>
-accept/spots on vhf and (by_zone 14,15,16 or call_zone 14,15,16)
-</verb></tscreen>
-
-then you will <em>ONLY</em> get VHF spots <em>from</em> or <em>to</em> CQ zones
-14, 15 and 16.
-
-<P>
-If you set a reject filter like this ...
-
-<tscreen><verb>
-reject/spots on hf/cw
-</verb></tscreen>
-
-Then you will get everything <em>EXCEPT</em> HF CW spots. You could make this
-single filter even more flexible. For example, if you are interested in IOTA
-and will work it even on CW even though normally you are not interested in
-CW, then you could say ...
-
-<tscreen><verb>
-reject/spots on hf/cw and not info iota
-</verb></tscreen>
-
-But in that case you might only be interested in iota and say:-
-
-<tscreen><verb>
-accept/spots not on hf/cw or info iota
-</verb></tscreen>
-
-which achieves exactly the same thing. You should choose one or the other
-until you are comfortable with the way it works. You can mix them if you
-wish (actually you can have an accept AND a reject on the same line) but
-don't attempt this until you are sure you know what you are doing!
-
-<P>
-You can arrange your filter lines into logical units, either for your own
-understanding or simply convenience. Here is an example ...
-
-<tscreen><verb>
-reject/spots 1 on hf/cw
-reject/spots 2 on 50000/1400000 not (by_zone 14,15,16 or call_zone 14,15,16)
-</verb></tscreen>
-
-What this does is to ignore all HF CW spots and also rejects any spots on VHF
-which don't either originate or spot someone in Europe.
-
-<P>
-This is an example where you would use a line number (1 and 2 in this case), if
-you leave the digit out, the system assumes '1'. Digits '0'-'9' are available.
-This make it easier to see just what filters you have set. It also makes it
-more simple to remove individual filters, during a contest for example.
-
-<P>
-You will notice in the above example that the second line has brackets. Look
-at the line logically. You can see there are 2 separate sections to it. We
-are saying reject spots that are VHF or above <em>APART</em> from those in
-zones 14, 15 and 16 (either spotted there or originated there). If you did
-not have the brackets to separate the 2 sections, then Spider would read it
-logically from the front and see a different expression entirely ...
-
-<tscreen><verb>
-(on 50000/1400000 and by_zone 14,15,16) or call_zone 14,15,16
-</verb></tscreen>
-
-The simple way to remember this is, if you use OR - use brackets. Whilst we are
-here CASE is not important. 'And BY_Zone' is just the same as 'and by_zone'.
-
-As mentioned earlier, setting several filters can be more flexible than
-simply setting one complex one. Doing it in this way means that if you want
-to alter your filter you can just redefine or remove one or more lines of it or
-one line. For example ...
-
-<tscreen><verb>
-reject/spots 1 on hf/ssb
-</verb></tscreen>
-
-would redefine our earlier example, or
-
-<tscreen><verb>
-clear/spots 1
-</verb></tscreen>
-
-To remove all the filter lines in the spot filter ...
-
-<tscreen><verb>
-clear/spots all