<div dir="ltr">It wasn't a fail2ban issue...<div><br></div><div>This particular provider says they only send SIP traffic over UDP, and I had only opened TCP traffic to port 5060 in my firewall.</div><div><br></div><div>The part I don't understand is how I was able to receive any calls at all from them without UDP/5060 open -- it worked for hours with my new firewall config up. That's just weird...</div><div><br></div><div>Also, can anybody explain why a provider would use UDP for SIP traffic? From my brief reading of the spec, it does seem to be a valid protocol to use, but UDP's fire and forget approach seems a poor choice for this task.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 3, 2019 at 11:56 AM David Villasmil <<a href="mailto:david.villasmil.work@gmail.com">david.villasmil.work@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello,<div><br></div><div>I'd say this is a question for shorewall. But since you're here, is there maybe some flood-prevention mechanism that would block it? Did you check shorewall's log to try and find the reason it was blocked?</div><div><br clear="all"><div><div dir="ltr" class="gmail-m_3202249550401791718gmail_signature"><div dir="ltr"><div>Regards,</div><div><br></div>David Villasmil<div>email: <a href="mailto:david.villasmil.work@gmail.com" target="_blank">david.villasmil.work@gmail.com</a></div><div>phone: +34669448337</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 3, 2019 at 6:07 PM Chad Phillips <<a href="mailto:chad@apartmentlines.com" target="_blank">chad@apartmentlines.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Recently I reconfigured my firewall (via Shorewall) to block all inbound traffic to port 5060, except for whitelisted IP addresses from my inbound DID providers. After setup, we ran tests and everything worked fine for all incoming calls across all providers.</div><div><br></div><div>Then a few hours later, calls from one of our providers started being blocked. All calls from our other providers continued coming through fine. Upon restarting our firewall service, the blocked calls from the single provider started coming through again.</div><div><br></div><div>Between our successful tests and the start of the issue, there were zero changes made to the server.</div><div><br></div><div>So why would my firewall suddenly start blocking inbound traffic from a whitelisted IP that it was previously letting through??</div><div><br></div><div><br></div></div>
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