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<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Thank you AUSNOG community for all the replies, I appreciate all the input and suggestions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">I’ve narrowed this down to a carrier issue as when we preference away the problem goes away.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">I will follow up and sort.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Thanks again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Darren.</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-AU">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-AU"> AusNOG <ausnog-bounces@lists.ausnog.net>
<b>On Behalf Of </b>Darren Moss<br>
<b>Sent:</b> Wednesday, 19 January 2022 4:38 PM<br>
<b>To:</b> AusNOG Mailing List <ausnog@ausnog.net><br>
<b>Subject:</b> [AusNOG] Challenge with SQL Replication over multiple carriers<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Hello Noggers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I have a handful of customers with SQL replication issues over 2 separate transit links between Sydney and Melbourne.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Looking to see if anyone here has experienced something similar or could potentially shed some light, perhaps more on my carrier configuration and traffic preferencing.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">We have 2x 10GBps interfaces in 2 separate datacentres for transit across 2 carriers. This link carries SQL replication.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">It appears when we are using 1 carrier link, everything seems fine and traffic replicates normally.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">However, when we balance between 2 carriers, into the same networks, we start seeing issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Connections are working, I can telnet, ICMP, etc, however when we start sending large packets we see semaphore timeout errors.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To me it points to TCPOffload, however that’s all disabled and I can see no incorrect packets, etc at both sides.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I have even tried routing the SQL traffic over a different network within the same BGP sessions, which works for a while, then eventually starts barfing with semaphore timeout issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">My question is with traffic preferencing, is there anything special I need to do when using multiple carriers at the same time for the same networks ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Happy to hear input and suggestions, off list would be better. I am happy to publish what steps were taken.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Many thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Darren.<o:p></o:p></span></p>
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