Comcast Business Support Community

/59 prefix delegation block changed...

I have a /56 static on Comcast Business. Recently I had a cable modem issue (as determiend by comcast) and the cable modem was replaced. Everything is working, but I received a different /59 (still inside my /56) so I had to renumber several vlans! How do I keep this from changing

Here's my info if it's helpful: Model: DPC3941B Vendor: Cisco Hardware Revision: 1.0 DOCSIS Software Version: 2.3.10.13_5.5.0.5

How to setup IPv6 without Comcast DHCPv6 prefix delegation

With the troubles I've had with IPv6 with this week's modem firmware update, I've determined how to utilize IPv6 without the modem's DHCPv6 PD. I've already commented on this in another thread, but I've decided to start another thread here as I've learned a bit more and so far things seem stable. I'

I used to have a HE tunnel back in the day... The problem is that I was trying to run servers over it, and port 25 was understandably blocked. Once I managed to get sendmail to not use IPv6 for any outgoing connections, I found that many IRC servers

How to setup IPv6 without Comcast DHCPv6 prefix delegation

With the troubles I've had with IPv6 with this week's modem firmware update, I've determined how to utilize IPv6 without the modem's DHCPv6 PD. I've already commented on this in another thread, but I've decided to start another thread here as I've learned a bit more and so far things seem stable. I'

Alas, IPv6 was broken again this morning. The modem would route traffic to the LAN, but IPv6 traffic FROM the LAN would not be routed by the modem even though the LAN could ping6 the modem. Even a modem restart wouldn't fix it. Perhaps a new modem w

LAN subnet needs to be inside the /59, but not the same /64 as the WAN.

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Excellent find and write up! I can confirm, at least with my Cisco 3941B that only the /59 gets routed to me in spite of setting RA to advertise my /56. Not an issue for my with my 3 subnets. I may toy around with this at some point, but I'm

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How to setup IPv6 without Comcast DHCPv6 prefix delegation

With the troubles I've had with IPv6 with this week's modem firmware update, I've determined how to utilize IPv6 without the modem's DHCPv6 PD. I've already commented on this in another thread, but I've decided to start another thread here as I've learned a bit more and so far things seem stable. I'

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How to setup IPv6 without Comcast DHCPv6 prefix delegation

With the troubles I've had with IPv6 with this week's modem firmware update, I've determined how to utilize IPv6 without the modem's DHCPv6 PD. I've already commented on this in another thread, but I've decided to start another thread here as I've learned a bit more and so far things seem stable. I'

6.3K

9

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/59 prefix delegation block changed...

I have a /56 static on Comcast Business. Recently I had a cable modem issue (as determiend by comcast) and the cable modem was replaced. Everything is working, but I received a different /59 (still inside my /56) so I had to renumber several vlans! How do I keep this from changing

Fun fact I learned the hard way. Apparently when not using prefix delegation, static mappings defined in DHCPv6 must include the prefix. The impression I have is that this is the general behavior and not just limited to PfSense (or even just isc-dhpd

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/59 prefix delegation block changed...

I have a /56 static on Comcast Business. Recently I had a cable modem issue (as determiend by comcast) and the cable modem was replaced. Everything is working, but I received a different /59 (still inside my /56) so I had to renumber several vlans! How do I keep this from changing

IPv6 broke on its own this morning... But I was able to get static prefix assignment working with PfSense so OpnSense should work too. I'm sure at least a few other routers will work as well. Assign your WAN interface a static IPv6 address in your p

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/59 prefix delegation block changed...

I have a /56 static on Comcast Business. Recently I had a cable modem issue (as determiend by comcast) and the cable modem was replaced. Everything is working, but I received a different /59 (still inside my /56) so I had to renumber several vlans! How do I keep this from changing

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