Folks at Comcast have told me to ask for the SMC gateway to be replaced with either the netgear or Cisco to solve that issue.
Jared Mauch > On Nov 29, 2016, at 1:28 PM, Bryan Holloway <br...@shout.net> wrote: > > I concur with the kudos bit, but I'll also concur that the CPE support > appears to be limited. Another example: IPv6 prefix delegation is broken on > the SMCD3G-CCR, and according to the following threads: > > http://www.gossamer-threads.com/lists/nsp/ipv6/54761 (scroll down to the IPv6 > OPERATIONS - BUSINESS section) > > http://forums.businesshelp.comcast.com/t5/IPV6/Dual-Stack-on-SMC-D3GCCR-and-Cisco-DPC3939B/td-p/20504 > > ... others have the same issue and there isn't much of an incentive to fix it. > > When I asked if I could use my own CPE, I was told no, because I'm a > "business customer", which is a requirement if you want static v4 IPs. > > Anyone have any success with a different model CPE and Comcast v6? I love > that they hand out a /56 by default, but it's not of much use if I can only > use a single /64. > > - bryan > > >> On 11/29/16 11:45 AM, Livingood, Jason wrote: >> I can send it along to folks here at Comcast. >> >> - Jason >> >> On 11/28/16, 1:46 PM, "NANOG on behalf of Rik van Riel" >> <nanog-boun...@nanog.org on behalf of r...@surriel.com> wrote: >> >> First of all, kudos to Comcast for trying to roll out IPv6 across >> their entire network. Static IPv6 netblocks seem to be available >> for Comcast business users, and IPv6 is enabled unconditionally >> in the CPE routers used by Comcast business class internet. >> >> Unfortunately, the software in the two available CPE routers >> (SMC & Cisco) is horribly broken when it comes to IPv6. >> >> The TL;DR summary: even when IPv6 firewalling is disabled in >> the configuration, the router still tracks every IPv6 "connection", >> which causes every single DNS lookup to fill up a slot in its >> connection tracking table. >> >> The router's logs say it blocks tens of thousands of IPv6 >> connections every day, despite firewalling being "disabled" on >> the router. >> >> Once the connection tracking table fills up, both IPv6 and IPv4 >> start having trouble, with packet loss on ICMP, high ping times >> to the local router (and the internet), and new connections not >> establishing. The router randomly crashes and reboots too, >> sometimes multiple times a day. >> >> This ends up breaking both IPv6 and IPv4. >> >> It only takes about 300kbit/s of DNS traffic to trigger the bug, >> in both the SMC and the Cisco routers. >> >> Are there any Comcast NOC or other technical people present who >> could help? >> >> I am interested both in helping resolve the firmware issues in >> the routers (there will no doubt be other customers who hit this >> in the future, as IPv6 becomes ore common) or, if that is not an >> option, finding some way to avoid the issue. >> >> >> http://forums.businesshelp.comcast.com/t5/Equipment-Modems-Gateways/Cis >> co-DPC3941B-slows-to-a-crawl-and-crashes-several-times-a-day/td-p/30807 >> >> -- >> All Rights Reversed. >>
