Hello all, We're an ISP re-selling Talk-Talk wholesale LLU DSL and Wholesale FTTC circuits to a UK national customer base.
Within the last couple of weeks we've started noticing that our customers that are using a SonicWALL firewall / BT Openreach modem combination on FTTC circuits (authenticating over PPPoE) have started to disconnect and simply will not come back online again. This has only affected our customers using these SonicWALLs on FTTC so far - nobody else. These same devices worked flawlessly on the BT WBMC network for several years without any issues and have recently worked flawlessly on the Talk Talk network for roughly one year until now. Talk-Talk have been carrying out a series of software / network upgrades this month and we suspect that it's probably related to one of those. We've been in touch with Talk Talk Support and they are investigating the issue but they don't seem to be having much luck at this stage. I was hoping that somebody out there may have experienced / noticed the same thing. I realise that this issue is quite specific, so unless you're using this kit in this configuration with this provider, then you may have not. The only thing that seems to resolve this at the moment is a complete hardware replacement with a Billion router, which is what we use at a number of our other customer sites. The Openreach modem remains in place so we know it's not an issue with that. The connection then comes back up without issue. Things we have tried so far... * Changing the MTU on the SonicWALL WAN taking it right down from 1500 in increments to below 1300. * We've tried a RADIUS Filter-ID of "l" (lower case L) to stop MRU renegotiation and a similar hard coded setting on the L2TP LNS tunnel for those particular circuits. * We've tried configuring a fixed MTU on the L2TP LNS tunnel for those particular circuits. * We've tried disabling IPv6 on the SonicWALL WAN interface doing the PPPoE authentication / negotiation. * We've tried switching both the SonicWALL and modem off for over half an hour to kill any potential stale sessions. Thank you. Kind Regards, Gareth Phillips. Disclaimer: Views or opinions presented are solely those of the author and do not necessarily represent those of Clearstream Technology Ltd or Clearstream Technology Group Ltd (Clearstream). Confidentiality: This email and any attached files are confidential and intended solely for the use of the individual(s) to whom it is addressed. If you are not the intended recipient, you have received this email in error and any use, dissemination, forwarding, printing or copying of this email is strictly prohibited. If you have received this email in error please contact the sender. Security: This e-mail has been created in the knowledge that Internet e-mail is not a 100% secure communications medium. We advise that you understand and observe this lack of security when e-mailing us. Although this email and any attachments are believed to be free of any virus or other defects which might affect any computer or IT system into which they are received, no responsibility is accepted by Clearstream or any of its associated companies for any loss or damage arising in any way from the receipt or use thereof.
