Internet not working but dns is correct

HILLbilly · 10-07-2003, 10:20 AM

Help! My internet is broken and it can't get up. My ISP is Knology out of southeast. A week or two ago, the turned off all ICMP (ping) traffic on their network. Since that time (I don't know if this is related), I have not been able to get on the internet with a linux machine. I dual boot RH 9.0 and WinXP. I get get on the internet in Windows, but not linux. A couple of weeks ago, I could get on the internet on both. I have loaded 5 different machines with different distros and none will connect. My dns is absolutely correct and my gateway is correct.

druuna · 10-07-2003, 10:26 AM

You type something that's conflicting:

turned off all ICMP (ping)

I think you did the first (turn off all icmp) and not just the 'ping' part

A short list of icmp:

ICMP
0 = echo-reply ===> ping
3 = destination-unreachable ===> any TCP/UDP trafic
5 = redirect ===> routing if not running routing daemon
8 = echo-request ===> ping
11 = time-exceeded ===> traceroute

If you don't want incomming ping packets deny/reject icmp 8 packets

HILLbilly · 10-07-2003, 10:29 AM

My ISP has stopped icmp traffic. Could that be causing my internet connection problems?

HILLbilly · 10-07-2003, 10:32 AM

No machine in my office is able to get on the internet. We have two isp's. If we connect on the Charter cable line, we can all get on. Funny, huh?

druuna · 10-07-2003, 10:38 AM

Only ping and traceroute are disabled by Knology:

Quote:

All Outbound & Inbound ICMP Traffic (ping, traceroute) Disabled Pending Further Notice

All Outbound & Inbound ICMP Traffic (ping, traceroute) Disabled Pending Further Notice. This means that no one can ping or traceroute to you, nor can you ping or traceroute to anyone. We are taking this action to reduce the traffic generated by blaster and its variants.

Don't know how your machine(s) are set up, what firewall (if any) you are using etc etc. So it's a bit hard to answer why it isn't working.

I do believe that a provider that disables services isn't a real provider, but that's just my personal opinion.......

HILLbilly · 10-07-2003, 10:41 AM

Well, I am a technician. I have been researching this problem for a week or so. I cannot ping knology's dns of course because ping is turned off. I have tried using charter's dns, sprint's dns and still nothing. I have tried with dhcp and static addressing.

HILLbilly · 10-07-2003, 10:42 AM

It is not just here at my office. It is any Knology serviced location. I have tried it at three different locations serviced by knology and get nothing, but I try it on charter and it works fine. When I boot into windows on charter or knology everything works fine.

druuna · 10-07-2003, 10:55 AM

I'm not a knology user, but if it's correct what they say on their site (http://www.knology.com/services/inte...quirements.cfm), only mac and windows are supported..........

And if they are that concerned with bandwith: They should get rid of the tunes they have with their pages

HILLbilly · 10-07-2003, 11:08 AM

Well, I solved my problem. I added my gateway as a nameserver in /etc/resolv.conf. This fixed it although now we are trying to figure out why that did it. Our gateway is not running dns or anything. Right now, I don't care. I am just glad to be on the NET!