Hi Tom If you change the IOS version, you should double check it with the bug search tool. For example 16.5 has a bug like Delay in DNS resolve after network flap 😊 . Usually it is either config or firmware related. Have you tried using a different DNS server and not going through the auto assignment ?
Regards, Melanie Gajic From: uknof <[email protected]> on behalf of Tom Storey <[email protected]> Date: Wednesday, 22 May 2019 at 14:11 To: James Bensley <[email protected]> Cc: "[email protected]" <[email protected]> Subject: Re: [uknof] Cisco 887VA - forwarding "kind of breaks" after a week CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hey James, controller VDSL 0 operating mode vdsl2 firmware filename flash:VA_A_39m_B_38h3_24h_o.bin modem UKfeature ! This particular image was recommended to me by someone that is a bit more familiar with BT last mile access than I am. IOS itself is down somewhere in the 15.6's. My usual response to wierd behaviour is to try upping the IOS version and see if it goes away. That is what I intend to try next - as soon as I can get my hands on a more recent image. Seems strange that the modem would prevent DNS from working though? Tom On Wed, 22 May 2019 at 13:29, James Bensley <[email protected]<mailto:[email protected]>> wrote: On Wed, 22 May 2019 at 09:48, Tom Storey <[email protected]<mailto:[email protected]>> wrote: > > Hi all, wondering if anyone has come across this and knows how to fix it. > > I have a Cisco 887VA at home, hooked up to a BT supplied VDSL line (cabinet > at end of street), what I believe is called "fibre", but my ISP is Zen. > > Ive noticed that very consistently after about a week (7-8 days), forwarding > partially breaks in some way. Im not sure if it is the Cisco or something > somewhere else, but I didnt have the same issue with the Zen supplied > FritzBox, so seems coincidental that it is the Cisco... > > The biggest thing I have noticed is that DNS seems to break. e.g. I could > have an audio stream playing, and it will continue to stream just fine, but > you wont be able to browse or resolve any other hostnames. I can also still > ping anything by IP just fine. > > I have a friend that is working for a managed service provider who has an > installed base of these routers and says they are also working on much the > same issue. > > If anyone has any suggestions, Im all ears! > > Thanks > Tom Hi Tom, On some of these smaller CPEs you can upgrade the modem firmware seperatly from the IOS image. Are you running latest and greatest modem firmware as well as IOS? Cheers, James.
