<div dir="ltr"><div class="markdown-here-wrapper" style=""><p style="margin:0px 0px 1.2em!important">no, very simple …<br>I have (for the sake of brevity) 2 interfaces:</p>
<p style="margin:0px 0px 1.2em!important">one is eth0 with ip <a href="http://123.45.67.1/30">123.45.67.1/30</a> and I have on the box 123.45.67.2 as default gateway.<br>on that link I bgp peer with 123.45.67.2 and announce my own /24, let’s say <a href="http://134.56.78.0/24">134.56.78.0/24</a></p>
<p style="margin:0px 0px 1.2em!important">another eth interface (eth1) hosts several ip addresses and one of these is <a href="http://134.56.78.5/24">134.56.78.5/24</a></p>
<p style="margin:0px 0px 1.2em!important">for that interface I allow port 443 to accept packets for </p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">[Interface]
ListenPort = 443
</code></pre><p style="margin:0px 0px 1.2em!important">but I do not allow packets to connect to <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline"><a href="http://123.45.67.1/30">123.45.67.1/30</a></code> on port 443 (as this iface is just my Provider’s /30</p>
<p style="margin:0px 0px 1.2em!important">when a client connects to <a href="http://134.56.78.5/24">134.56.78.5/24</a>, the wg server tells the client that it’s destination is <a href="http://123.45.67.1/30">123.45.67.1/30</a> for this link , and that gets of course firewalled.<br>So reluctantly I opened up port 443 on the uplink interface to accomodate this, erm, inconvenience. </p>
<p style="margin:0px 0px 1.2em!important">on client side I have a config :</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">[Peer]
PublicKey = (hidden)
EndPoint = <a href="http://134.56.78.5:443">134.56.78.5:443</a>
AllowedIPs = <a href="http://0.0.0.0/0">0.0.0.0/0</a>
</code></pre><p style="margin:0px 0px 1.2em!important">but when connection is established<br><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">wg show</code> says :</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">peer: (hidden)
endpoint: <a href="http://123.34.56.1:443">123.34.56.1:443</a>
allowed ips: <a href="http://10.0.0.0/8">10.0.0.0/8</a>
latest handshake: 36 seconds ago
transfer: 468.40 MiB received, 17.88 MiB sent
</code></pre><p style="margin:0px 0px 1.2em!important">but now of course, when the third interface eth2 will arrive, with another subnet to another provider, my announced IP <a href="http://134.56.78.5/24">134.56.78.5/24</a> may not be altered by the path taken, otherwise the clients need to reconnect…</p>
<p style="margin:0px 0px 1.2em!important">but I don’t know for sure… it seems to be a regression somewhere as I don’t recall to have that problem before… I had to add this accept rule last week, suddenly, as some peers could connect, but not transfer packets any more.</p>
<p style="margin:0px 0px 1.2em!important">Now I understand that wg finds it’s IP by following the shortest path, but that is, in my case, counterproductive.<br>It should reply with the IP it was spoken to (here 134.56.78.5)</p>
<p style="margin:0px 0px 1.2em!important">I think ;-)</p>
<p style="margin:0px 0px 1.2em!important">Jan</p>
<p style="margin:0px 0px 1.2em!important">On Thu, Aug 10, 2017 at 5:51 PM Jason A. Donenfeld <<a href="mailto:Jason@zx2c4.com" target="_blank">Jason@zx2c4.com</a>> wrote:</p>
<p style="margin:0px 0px 1.2em!important"></p><div class="markdown-here-exclude"><p></p><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hey Jan,<br>
<br>
> When wireguard clients connect, their config shows their peer<br>
> to be the Uplink IP address instead of the IP on the Public<br>
> interface that was specifically assigned for wireguard (wgsrv)<br>
<br>
Do you mean to say that the _endpoint_ IP address of the WireGuard<br>
peer is an IP associated with Uplink instead of with Public? If this<br>
is the case, it might be some odd DNAT situation causing this to<br>
happen for you? The peer's endpoint IP address is simply the src IP of<br>
the most recently authenticated packet from the peer. It sounds like<br>
there's something odd in place causing the src IP to be wrong? But I<br>
can't think of how this would be WireGuard related. Unless I've<br>
misunderstood something?<br>
<br>
Jason<br>
</blockquote><p></p></div><p style="margin:0px 0px 1.2em!important"></p>
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