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<div dir="auto">I think this is the case for some of them.<br />
<br />
For example, EA4RCH-5 is dxfun.com where people can send spots via a web interface, they’re not necessarily logged on to the node itself.<br />
<br />
I’m seeing a lot of “Bad Spots” where the originating node is EA4RCH-5 because the user isn’t logged on. They’re probably not bad spots.<br />
<br />
73 Keith</div>
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<div name="messageReplySection">On 17 Feb 2025 at 10:39 +0000, IZ2LSC via Dxspider-support <dxspider-support@tobit.co.uk>, wrote:<br />
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<div>I cannot believe that 60% of the traffic is really a fake. Maybe it is misclassified because it is not possible to identify if the spotter is really connected to a cluster (if the cluster doesn't send pc92).</div>
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<div>73s</div>
<div>andrea</div>
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<div dir="ltr" class="gmail_attr">On Mon, Feb 17, 2025 at 11:35 AM IZ2LSC <<a href="mailto:iz2lsc.andrea@gmail.com">iz2lsc.andrea@gmail.com</a>> wrote:<br /></div>
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<div>Iain, </div>
<div>if 60% of the traffic is fake and senderverify=2 </div>
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<div>then pc61 is dumped (discarded)</div>
<div>as per Dirk mail.</div>
<div><span style="font-size:large">If set to 1, pass it onward to other nodes. If set to 2 and it's a PC61 then dump it. If set to 3 then just dump it.</span></div>
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<div class="gmail_signature">Can you clarify where I misunderstood ?</div>
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<div dir="ltr" class="gmail_attr">On Mon, Feb 17, 2025 at 11:12 AM Iain Philipps <<a href="mailto:iain.philipps@77hz.net" target="_blank">iain.philipps@77hz.net</a>> wrote:<br /></div>
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<p class="MsoNormal"><span>Andrea,<br />
<br />
You have misunderstood. Legitimate spots are *<b>not</b>* being discarded.<br />
<br />
Because:-> </span><span style="color:blue;background:white">most of the traffic sent today is very likely fake. <-<br />
<br />
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:blue;background:white"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:blue;background:white"><br /></span><span style="color:black;background:white">73 de WR3D</span><span><br />
<br />
<br />
<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span lang="EN-US" xml:lang="EN-US">From:</span></b> <span lang="EN-US" xml:lang="EN-US">Dxspider-support <<a href="mailto:dxspider-support-bounces@tobit.co.uk" target="_blank">dxspider-support-bounces@tobit.co.uk</a>> <b>On Behalf Of</b> IZ2LSC via Dxspider-support<br />
<b>Sent:</b> 17 February 2025 10:09<br />
<b>To:</b> The DXSpider Support list <<a href="mailto:dxspider-support@tobit.co.uk" target="_blank">dxspider-support@tobit.co.uk</a>><br />
<b>Cc:</b> IZ2LSC <<a href="mailto:iz2lsc.andrea@gmail.com" target="_blank">iz2lsc.andrea@gmail.com</a>><br />
<b>Subject:</b> Re: [Dxspider-support] Here we are again (huge flooding)<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Kin, <u></u><u></u></p>
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<p class="MsoNormal">how many legitimate spots is senderverify=2 discarding during normal conditions?<u></u><u></u></p>
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<p class="MsoNormal">I understood this is still work in progress as from Dirk email he got 60% of spots dropped. This is not fine:<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="color:blue;background:white">"</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:blue;background:white">The result I got for a morning's traffic (the natural result of a grepdbg on today's log with sendverify set) is:</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:blue;background:white"><br />
60.22 (%)<br />
<br />
Or to put it another way, most of the traffic sent today is very likely fake.<br />
<br />
<span>Houston</span>, we have a problem...</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:blue;background:white">"</span><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Andrea<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">--><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Mon, Feb 17, 2025 at 8:45 AM Kin via Dxspider-support <<a href="mailto:dxspider-support@tobit.co.uk" target="_blank">dxspider-support@tobit.co.uk</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi,<br />
<br />
From the last attack I have seen the following:<br />
* Link crashes with partners. With greater impact on those with less hw<br />
resources.<br />
* Delays of up to 5 minutes in sending spots to users in some of the larger<br />
nodes.<br />
* More affected on Windows than on Linux.<br />
* On my node with 'set/var $DXProt::senderverify 2' the behaviour was as<br />
expected, no forged spots were fake.<br />
grep -i "bad spot" 047.dat | wc -l<br />
287005 <-- EA4URE-2<br />
381899 <-- EA3CV-2<br />
<br />
1739707974^(*) PCPROT: Bad Spot CR3DX on 14089.6 by<br />
N3LPT-3(70.139.124.201)@SM4ONW-14 User N3LPT-3 not on node SM4ONW-14, DUMPED<br />
1739707974^(*) PCPROT: Bad Spot CR3DX on 7025.0 by<br />
N0LPT-3(70.139.201.124)@SP6MI-2 User N0LPT-3 not on node SP6MI-2, DUMPED<br />
1739707974^(*) PCPROT: Bad Spot CR3DX on 28431.4 by<br />
N3LPT-3(70.139.124.201)@PA0ESH-3 User N3LPT-3 not on node PA0ESH-3, DUMPED<br />
1739707974^(*) PCPROT: Bad Spot CR3DX on 21132.3 by<br />
N5LPT-3(70.124.139.201)@GB7NHR User N5LPT-3 not on node GB7NHR, DUMPED<br />
1739707974^(*) PCPROT: Bad Spot CR3DX on 28438.0 by<br />
N0LPT-3(70.201.139.124)@PI1LAP-1 User N0LPT-3 not on node PI1LAP-1, DUMPED<br />
<br />
On my other node without enabling this feature, thousands of them were<br />
received.<br />
* The attack was based on varying the fields: spotted, comment, spotter,<br />
spotter ip and source node.<br />
* It appears that the spots were not sent from the source nodes listed in<br />
the spots. I have verified that the ones where my node appears as the source<br />
node, did not come from my node, so I think that this must have happened to<br />
most of them.<br />
<br />
My own conclusions<br />
* Dirk's algorithm was successful for nodes that used $DXProt::senderverify<br />
to remove dupes.<br />
* If the attack had been without 'dupes', it could not have been stopped.<br />
* The flood of spots that inundated the network clearly affected nodes with<br />
fewer resources, with a less efficient OS or with a sw other than spider.<br />
<br />
Kin EA3CV<br />
<br />
<br />
<br />
<br />
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