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Forum Discussion
Solved
C6300 firmware update
I discovered that my R6300 Modem/Router is in need of a firmware update. By all accounts I can not do this myself in the usual fashion and everything I am reading says that my ISP must do the update....
@Belcantor Looks like the issue you have is a minor bug that has been fixed and will be available in next FW release once Comcast has approved it and pushes it out. In the meantime there is a work around you can use to address. So in order to avoid issues with DNS you need to make sure all 3 DNS fields are filled out.
Workaround for C6300 Minor DNS Bug:
1. Log into your C6300
2. Go to Advanced > Setup > Internet Setup
3. On Internet Setup page select Use these DNS Servers.
4. Fill in Primary, Secondary and Tertiary DNS server boxes.
5. For Primary and Secondary DNS use Comcast DNS and for Tertiary either copy the 2nd DNS server to it or use 8.8.8.8 or 8.8.4.4 or 1.1.1.1 or 1.0.0.1. For best performance and security you probably want to use the Cloud Flare DNS 1.1.1.1 or 1.0.0.1
6. Once all the DNS settings have been specified click apply and you should be good to go.
PS: If you need more info on 1.1.1.1 and 1.0.0.1 DNSs you can see it here https://1.1.1.1/
The problem isn't getting the firmware update. the problem is is that the firmware has been modified so that the DNS servers from Comcast are hardwired in and you can't change them. This is so even on customer-owned modems.
@Belcantor Looks like the issue you have is a minor bug that has been fixed and will be available in next FW release once Comcast has approved it and pushes it out. In the meantime there is a work around you can use to address. So in order to avoid issues with DNS you need to make sure all 3 DNS fields are filled out.
Workaround for C6300 Minor DNS Bug:
1. Log into your C6300
2. Go to Advanced > Setup > Internet Setup
3. On Internet Setup page select Use these DNS Servers.
4. Fill in Primary, Secondary and Tertiary DNS server boxes.
5. For Primary and Secondary DNS use Comcast DNS and for Tertiary either copy the 2nd DNS server to it or use 8.8.8.8 or 8.8.4.4 or 1.1.1.1 or 1.0.0.1. For best performance and security you probably want to use the Cloud Flare DNS 1.1.1.1 or 1.0.0.1
6. Once all the DNS settings have been specified click apply and you should be good to go.
PS: If you need more info on 1.1.1.1 and 1.0.0.1 DNSs you can see it here https://1.1.1.1/
- So this workaround will result in bypassing the Comcast DNS servers and use whatever is in the tertiary DNS field?
- Your suggestion to enter DNS ips in all three fields worked. Entered Comcast up 75.75.75.75 in first two fields and 1.0.0.1 in tertiary field and applied change. Then replaced the first two fields with Google's DNS and hit apply and it worked. Ipconfig then showed Google's DNS on all devices downstream from the router. Kudos. Unfortunate that Comcast couldn't explain this without me spending 3 or 4 hours on the phone over 3 days. A further update on Comcast tech support; not only is the business tech support willing to help non-business customers, but there is a group called high speed internet tech support you can speak with by asking for them. My advice? Avoid the consumer tech support and you will avoid major hassles.