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<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">On 2 Aug 2015 at 23:58, djk wrote:</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> One of the rather confusing things about filters is that one can have </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> 'input' and 'output' filters. The default is 'output'. This means that </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> the filter operates on spots emanating 'out' of the node - i.e. to the </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> users or connected nodes. The reason this is the default is that the </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> user is only interesting in stuff coming 'out' of the node to him/her. </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> The 'input' filter will work for the user as well, but it will filter </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> the dx spots that are being sent - an unlikely scenario.</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> But for nodes, you have two options:</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> 1. You can accept all spots and then provide a user_default filter that </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> does what you want, but allows the user to override it.</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> 2. You can filter the spots on input (i.e. rej/spot node_default input </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> ...) which will drop those spots on the floor *on input* with no </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> override possible by a user. The more elegant way requires a bit of </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> lateral thinking: your node is effectively a user on the peer node that </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> you are connected to. So you can set your required filter *on your peer </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> node* with a simple 'rcmd gb7xxx reject/spot ...' and that will prevent </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> any those spots arriving onto your node in the first place.</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> Also if I read what you want to filter correctly you actually want:</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> reject/spot node_default on hf and by_zone 14,15</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> or</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> rcmd gb7xxx reject/spot on hf and by_zone 14,15</span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> </span></font></div>
<div align="left"><font face="Arial" color="#7f0000" size="2"><span style=" font-size:10pt">> Which will reject all hf spots coming from zone 14/15.</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">Many thanks Dirk, you'll given me exactly the hint I needed to get the input filter working on
GB7DXC-5 - the secret is in the word "input"!</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">I was trying to set an input filter on the 'DXC-5 node to "drop on the floor" all spots that </span>
<span style=" font-size:10pt"><u>don't</u></span><span style=" font-size:10pt">
come from zones 14 & 15, ie. all spots from the rest of the world other than from western EU,
but I hadn't appreciated that it was necessary to include the word "input" in the filter string.</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">I've now implemented the following on 'DXC-5:</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"> rej/spot node_default INPUT on hf and NOT by_zone 14,15</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">and this seems to be doing exactly what I wanted - when I'm logged in to the sysop console
on 'DXC-5 I only see spots that have been generated by stations in western EU.</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">It's very helpful to have this sorted out because it will also help me to set a filter on GB7BAA
for its feed to the existing AK1A-based GB7DXC node that I'm keeping running for the time
being - I occasionally, eg. during periods of heavy contest activity, use 'rcmd/GB7BAA' to set
a filter on what spots get fed to 'DXC.</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt"><br />
</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">--</span></font></div>
<div align="left"><font face="Arial" size="2"><span style=" font-size:10pt">73, Martin G0HDB</span></font></div>
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