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&#160;<span id="projectnumber">0.12.2.1</span>
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<div id="projectbrief">P2P Digital Currency</div>
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<div class="textblock"><code>#include &quot;<a class="el" href="netaddress_8h_source.html">netaddress.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="protocol_8h_source.html">protocol.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="random_8h_source.html">random.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="sync_8h_source.html">sync.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="timedata_8h_source.html">timedata.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="util_8h_source.html">util.h</a>&quot;</code><br />
<code>#include &lt;map&gt;</code><br />
<code>#include &lt;set&gt;</code><br />
<code>#include &lt;stdint.h&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
</div>
<p><a href="addrman_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCAddrInfo.html">CAddrInfo</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classCAddrMan.html">CAddrMan</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ab09df186aa818ce7b9e7c86446511cf1"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#ab09df186aa818ce7b9e7c86446511cf1">ADDRMAN_TRIED_BUCKET_COUNT</a>&#160;&#160;&#160;256</td></tr>
<tr class="memdesc:ab09df186aa818ce7b9e7c86446511cf1"><td class="mdescLeft">&#160;</td><td class="mdescRight">total number of buckets for tried addresses <a href="#ab09df186aa818ce7b9e7c86446511cf1">More...</a><br /></td></tr>
<tr class="separator:ab09df186aa818ce7b9e7c86446511cf1"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a74a626eb1dbb8e307a413e86493cd510"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a74a626eb1dbb8e307a413e86493cd510">ADDRMAN_NEW_BUCKET_COUNT</a>&#160;&#160;&#160;1024</td></tr>
<tr class="memdesc:a74a626eb1dbb8e307a413e86493cd510"><td class="mdescLeft">&#160;</td><td class="mdescRight">total number of buckets for new addresses <a href="#a74a626eb1dbb8e307a413e86493cd510">More...</a><br /></td></tr>
<tr class="separator:a74a626eb1dbb8e307a413e86493cd510"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3499731a6c89e164cf74b68be2be0a84"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a3499731a6c89e164cf74b68be2be0a84">ADDRMAN_BUCKET_SIZE</a>&#160;&#160;&#160;64</td></tr>
<tr class="memdesc:a3499731a6c89e164cf74b68be2be0a84"><td class="mdescLeft">&#160;</td><td class="mdescRight">maximum allowed number of entries in buckets for new and tried addresses <a href="#a3499731a6c89e164cf74b68be2be0a84">More...</a><br /></td></tr>
<tr class="separator:a3499731a6c89e164cf74b68be2be0a84"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a87c7c90e3631bf1a4475cabdded61f6f"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a87c7c90e3631bf1a4475cabdded61f6f">ADDRMAN_TRIED_BUCKETS_PER_GROUP</a>&#160;&#160;&#160;8</td></tr>
<tr class="memdesc:a87c7c90e3631bf1a4475cabdded61f6f"><td class="mdescLeft">&#160;</td><td class="mdescRight">over how many buckets entries with tried addresses from a single group (/16 for IPv4) are spread <a href="#a87c7c90e3631bf1a4475cabdded61f6f">More...</a><br /></td></tr>
<tr class="separator:a87c7c90e3631bf1a4475cabdded61f6f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a09c090218fd02375aa57eb7e8eb1c013"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a09c090218fd02375aa57eb7e8eb1c013">ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP</a>&#160;&#160;&#160;64</td></tr>
<tr class="memdesc:a09c090218fd02375aa57eb7e8eb1c013"><td class="mdescLeft">&#160;</td><td class="mdescRight">over how many buckets entries with new addresses originating from a single group are spread <a href="#a09c090218fd02375aa57eb7e8eb1c013">More...</a><br /></td></tr>
<tr class="separator:a09c090218fd02375aa57eb7e8eb1c013"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a230e30813119d10bdba59c1f8cc789cd"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a230e30813119d10bdba59c1f8cc789cd">ADDRMAN_NEW_BUCKETS_PER_ADDRESS</a>&#160;&#160;&#160;8</td></tr>
<tr class="memdesc:a230e30813119d10bdba59c1f8cc789cd"><td class="mdescLeft">&#160;</td><td class="mdescRight">in how many buckets for entries with new addresses a single address may occur <a href="#a230e30813119d10bdba59c1f8cc789cd">More...</a><br /></td></tr>
<tr class="separator:a230e30813119d10bdba59c1f8cc789cd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a86698b159625d84b47a2ffddc76ebc99"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a86698b159625d84b47a2ffddc76ebc99">ADDRMAN_HORIZON_DAYS</a>&#160;&#160;&#160;30</td></tr>
<tr class="memdesc:a86698b159625d84b47a2ffddc76ebc99"><td class="mdescLeft">&#160;</td><td class="mdescRight">how old addresses can maximally be <a href="#a86698b159625d84b47a2ffddc76ebc99">More...</a><br /></td></tr>
<tr class="separator:a86698b159625d84b47a2ffddc76ebc99"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a771c05a7a20d9a35f4546e1e333c48c4"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a771c05a7a20d9a35f4546e1e333c48c4">ADDRMAN_RETRIES</a>&#160;&#160;&#160;3</td></tr>
<tr class="memdesc:a771c05a7a20d9a35f4546e1e333c48c4"><td class="mdescLeft">&#160;</td><td class="mdescRight">after how many failed attempts we give up on a new node <a href="#a771c05a7a20d9a35f4546e1e333c48c4">More...</a><br /></td></tr>
<tr class="separator:a771c05a7a20d9a35f4546e1e333c48c4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a26430e6e9a3ef9f4fc54491330b7e611"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a26430e6e9a3ef9f4fc54491330b7e611">ADDRMAN_MAX_FAILURES</a>&#160;&#160;&#160;10</td></tr>
<tr class="memdesc:a26430e6e9a3ef9f4fc54491330b7e611"><td class="mdescLeft">&#160;</td><td class="mdescRight">how many successive failures are allowed ... <a href="#a26430e6e9a3ef9f4fc54491330b7e611">More...</a><br /></td></tr>
<tr class="separator:a26430e6e9a3ef9f4fc54491330b7e611"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a7dcc28590c48ca382d26c4f37fda4e3d"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a7dcc28590c48ca382d26c4f37fda4e3d">ADDRMAN_MIN_FAIL_DAYS</a>&#160;&#160;&#160;7</td></tr>
<tr class="memdesc:a7dcc28590c48ca382d26c4f37fda4e3d"><td class="mdescLeft">&#160;</td><td class="mdescRight">... in at least this many days <a href="#a7dcc28590c48ca382d26c4f37fda4e3d">More...</a><br /></td></tr>
<tr class="separator:a7dcc28590c48ca382d26c4f37fda4e3d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a06edfd03ad361fbc74794e1c533d1bc5"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#a06edfd03ad361fbc74794e1c533d1bc5">ADDRMAN_GETADDR_MAX_PCT</a>&#160;&#160;&#160;23</td></tr>
<tr class="memdesc:a06edfd03ad361fbc74794e1c533d1bc5"><td class="mdescLeft">&#160;</td><td class="mdescRight">the maximum percentage of nodes to return in a getaddr call <a href="#a06edfd03ad361fbc74794e1c533d1bc5">More...</a><br /></td></tr>
<tr class="separator:a06edfd03ad361fbc74794e1c533d1bc5"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad10877f29a66224fce5c20d33e26448a"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="addrman_8h.html#ad10877f29a66224fce5c20d33e26448a">ADDRMAN_GETADDR_MAX</a>&#160;&#160;&#160;2500</td></tr>
<tr class="memdesc:ad10877f29a66224fce5c20d33e26448a"><td class="mdescLeft">&#160;</td><td class="mdescRight">the maximum number of nodes to return in a getaddr call <a href="#ad10877f29a66224fce5c20d33e26448a">More...</a><br /></td></tr>
<tr class="separator:ad10877f29a66224fce5c20d33e26448a"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a3499731a6c89e164cf74b68be2be0a84"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3499731a6c89e164cf74b68be2be0a84">&#9670;&nbsp;</a></span>ADDRMAN_BUCKET_SIZE</h2>
<div class="memitem">
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<td class="memname">#define ADDRMAN_BUCKET_SIZE&#160;&#160;&#160;64</td>
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<p>maximum allowed number of entries in buckets for new and tried addresses </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00140">140</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8h_source.html#l00437">CAddrMan::Clear()</a>, <a class="el" href="addrman_8cpp_source.html#l00026">CAddrInfo::GetBucketPosition()</a>, <a class="el" href="addrman_8cpp_source.html#l00332">CAddrMan::Select_()</a>, and <a class="el" href="addrman_8h_source.html#l00285">CAddrMan::Serialize()</a>.</p>
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</div>
<a id="ad10877f29a66224fce5c20d33e26448a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad10877f29a66224fce5c20d33e26448a">&#9670;&nbsp;</a></span>ADDRMAN_GETADDR_MAX</h2>
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<div class="memproto">
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<td class="memname">#define ADDRMAN_GETADDR_MAX&#160;&#160;&#160;2500</td>
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</div><div class="memdoc">
<p>the maximum number of nodes to return in a getaddr call </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00167">167</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00457">CAddrMan::GetAddr_()</a>.</p>
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</div>
<a id="a06edfd03ad361fbc74794e1c533d1bc5"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a06edfd03ad361fbc74794e1c533d1bc5">&#9670;&nbsp;</a></span>ADDRMAN_GETADDR_MAX_PCT</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">#define ADDRMAN_GETADDR_MAX_PCT&#160;&#160;&#160;23</td>
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<p>the maximum percentage of nodes to return in a getaddr call </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00164">164</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00457">CAddrMan::GetAddr_()</a>.</p>
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<a id="a86698b159625d84b47a2ffddc76ebc99"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a86698b159625d84b47a2ffddc76ebc99">&#9670;&nbsp;</a></span>ADDRMAN_HORIZON_DAYS</h2>
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<div class="memproto">
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<td class="memname">#define ADDRMAN_HORIZON_DAYS&#160;&#160;&#160;30</td>
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<p>how old addresses can maximally be </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00152">152</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00032">CAddrInfo::IsTerrible()</a>.</p>
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<a id="a26430e6e9a3ef9f4fc54491330b7e611"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a26430e6e9a3ef9f4fc54491330b7e611">&#9670;&nbsp;</a></span>ADDRMAN_MAX_FAILURES</h2>
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<td class="memname">#define ADDRMAN_MAX_FAILURES&#160;&#160;&#160;10</td>
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<p>how many successive failures are allowed ... </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00158">158</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00032">CAddrInfo::IsTerrible()</a>.</p>
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<a id="a7dcc28590c48ca382d26c4f37fda4e3d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a7dcc28590c48ca382d26c4f37fda4e3d">&#9670;&nbsp;</a></span>ADDRMAN_MIN_FAIL_DAYS</h2>
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<td class="memname">#define ADDRMAN_MIN_FAIL_DAYS&#160;&#160;&#160;7</td>
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<p>... in at least this many days </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00161">161</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00032">CAddrInfo::IsTerrible()</a>.</p>
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<a id="a74a626eb1dbb8e307a413e86493cd510"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a74a626eb1dbb8e307a413e86493cd510">&#9670;&nbsp;</a></span>ADDRMAN_NEW_BUCKET_COUNT</h2>
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<td class="memname">#define ADDRMAN_NEW_BUCKET_COUNT&#160;&#160;&#160;1024</td>
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<p>total number of buckets for new addresses </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00137">137</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8h_source.html#l00437">CAddrMan::Clear()</a>, <a class="el" href="addrman_8cpp_source.html#l00018">CAddrInfo::GetNewBucket()</a>, <a class="el" href="addrman_8cpp_source.html#l00196">CAddrMan::Good_()</a>, <a class="el" href="addrman_8cpp_source.html#l00148">CAddrMan::MakeTried()</a>, <a class="el" href="addrman_8cpp_source.html#l00332">CAddrMan::Select_()</a>, <a class="el" href="addrman_8h_source.html#l00285">CAddrMan::Serialize()</a>, and <a class="el" href="addrman_8h_source.html#l00335">CAddrMan::Unserialize()</a>.</p>
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<a id="a230e30813119d10bdba59c1f8cc789cd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a230e30813119d10bdba59c1f8cc789cd">&#9670;&nbsp;</a></span>ADDRMAN_NEW_BUCKETS_PER_ADDRESS</h2>
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<td class="memname">#define ADDRMAN_NEW_BUCKETS_PER_ADDRESS&#160;&#160;&#160;8</td>
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<p>in how many buckets for entries with new addresses a single address may occur </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00149">149</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00245">CAddrMan::Add_()</a>, and <a class="el" href="addrman_8h_source.html#l00335">CAddrMan::Unserialize()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a09c090218fd02375aa57eb7e8eb1c013">&#9670;&nbsp;</a></span>ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP</h2>
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<td class="memname">#define ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP&#160;&#160;&#160;64</td>
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<p>over how many buckets entries with new addresses originating from a single group are spread </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00146">146</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00018">CAddrInfo::GetNewBucket()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a771c05a7a20d9a35f4546e1e333c48c4">&#9670;&nbsp;</a></span>ADDRMAN_RETRIES</h2>
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<td class="memname">#define ADDRMAN_RETRIES&#160;&#160;&#160;3</td>
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<p>after how many failed attempts we give up on a new node </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00155">155</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00032">CAddrInfo::IsTerrible()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab09df186aa818ce7b9e7c86446511cf1">&#9670;&nbsp;</a></span>ADDRMAN_TRIED_BUCKET_COUNT</h2>
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<td class="memname">#define ADDRMAN_TRIED_BUCKET_COUNT&#160;&#160;&#160;256</td>
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<p>total number of buckets for tried addresses </p>
<p>Stochastic address manager</p>
<p>Design goals:</p><ul>
<li>Keep the address tables in-memory, and asynchronously dump the entire table to peers.dat.</li>
<li>Make sure no (localized) attacker can fill the entire table with his nodes/addresses.</li>
</ul>
<p>To that end:</p><ul>
<li>Addresses are organized into buckets.<ul>
<li>Addresses that have not yet been tried go into 1024 "new" buckets.<ul>
<li>Based on the address range (/16 for IPv4) of the source of information, 64 buckets are selected at random.</li>
<li>The actual bucket is chosen from one of these, based on the range in which the address itself is located.</li>
<li>One single address can occur in up to 8 different buckets to increase selection chances for addresses that are seen frequently. The chance for increasing this multiplicity decreases exponentially.</li>
<li>When adding a new address to a full bucket, a randomly chosen entry (with a bias favoring less recently seen ones) is removed from it first.</li>
</ul>
</li>
<li>Addresses of nodes that are known to be accessible go into 256 "tried" buckets.<ul>
<li>Each address range selects at random 8 of these buckets.</li>
<li>The actual bucket is chosen from one of these, based on the full address.</li>
<li>When adding a new good address to a full bucket, a randomly chosen entry (with a bias favoring less recently tried ones) is evicted from it, back to the "new" buckets.</li>
</ul>
</li>
<li>Bucket selection is based on cryptographic hashing, using a randomly-generated 256-bit key, which should not be observable by adversaries.</li>
<li>Several indexes are kept for high performance. Defining DEBUG_ADDRMAN will introduce frequent (and expensive) consistency checks for the entire data structure. </li>
</ul>
</li>
</ul>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00134">134</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8h_source.html#l00437">CAddrMan::Clear()</a>, <a class="el" href="addrman_8cpp_source.html#l00011">CAddrInfo::GetTriedBucket()</a>, and <a class="el" href="addrman_8cpp_source.html#l00332">CAddrMan::Select_()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a87c7c90e3631bf1a4475cabdded61f6f">&#9670;&nbsp;</a></span>ADDRMAN_TRIED_BUCKETS_PER_GROUP</h2>
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<td class="memname">#define ADDRMAN_TRIED_BUCKETS_PER_GROUP&#160;&#160;&#160;8</td>
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<p>over how many buckets entries with tried addresses from a single group (/16 for IPv4) are spread </p>
<p class="definition">Definition at line <a class="el" href="addrman_8h_source.html#l00143">143</a> of file <a class="el" href="addrman_8h_source.html">addrman.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="addrman_8cpp_source.html#l00011">CAddrInfo::GetTriedBucket()</a>.</p>
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