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http intermittently not working idirect 5100

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Mar 24th, 2008 at 6:03pm  
Having an issue with an idirect 5100.  Occasionaly we were having problems with exactly what the subject line states.  According to IP stats, both UDP and TCP are passing traffic.  However, no access to http.  Not utilizing DHCP from the modem but have a Cisco Soho going into a switch.  Thought it possibly could be router so bypassed it and jacked directly in the back of modem.  Same issue.  Reboot modem and it's good for about 10 minutes and then back to no http traffic.

I've heard that this could be caused by the processor being bogged down by the TCP sessions.

Any help would be greatly appreciate and reduce my brain cramps/man hours:)  Thanks in advance!

Note: Have swapped out modem and reason for other traffic other than http are VOIPs...
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« Last Edit: Mar 25th, 2008 at 2:36am by N/A »  
 
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Reply #1 - Mar 25th, 2008 at 8:29am  
try connect the modem direct with laptop by cross-cable
and see what happen
or do PING  and check on DNS  for ISP if it's work and give you replay contact with your provider
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Reply #2 - Mar 27th, 2008 at 3:30pm  
I can ping the DNS... I can ping any webpage... but when it comes to http.  I cannot load anything.  Even on the ip stats, it shows TCP, UDP, and ICMP traffic passing...  but no http...
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Reply #3 - Mar 28th, 2008 at 12:00am  
very interesting.

i have exactly the SAME problem just today after requesting my provider give me private IPs.

My problem is a bit more though ...
it does everything you mentioned + yahoo and any messenger client will disconnect as soon as theres activity.

its driving me nuts!


the only thing i noticed (besides the ip changes) the provider made in the option file and in the iSite gui is the fact that theres now a checkmark next to the Enable NAT box.
Now. not knowing much about iDirect modems but I am guessing its a NAT problem.
Because why is it when I had a public IP (just one) the NAT box was NOT enabled and the problem i am having now didnt exist?

drama drama drama!

anybody got any feedback?

(and no it didnt fix it when connecting directly to one PC.)

on a side note; look at this

> cpu
CPU Load : 91%

[RMT:53998] admin@telnet:10.11.12.5;1524
> cpu
CPU Load : 91%

[RMT:53998] admin@telnet:10.11.12.5;1524
> cpu
CPU Load : 91%

[RMT:53998] admin@telnet:10.11.12.5;1524
> cpu
CPU Load : 92%

[RMT:53998] admin@telnet:10.11.12.5;1524
> cpu
CPU Load : 92%

[RMT:53998] admin@telnet:10.11.12.5;1524
> cpu
CPU Load : 92%

[RMT:53998] admin@telnet:10.11.12.5;1524
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Reply #4 - Mar 28th, 2008 at 11:11am  
CPU load was brought down to 7% once DNS cache was turned off.

dropped packets also ceased ..

perhaps these idirect terminals whether it be 3100 or 5100 or whatever just have a software bug with the dns cache?

What version of the firmware do you have?

(mine is 7.0.5)
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Reply #5 - Mar 29th, 2008 at 9:27pm  
anybody else got any feedback on this issue?
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Reply #6 - Mar 30th, 2008 at 4:20pm  
i happened like this with my but also I have not solve this problem . so i do restart for modem evrytime happen like this
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Reply #7 - Mar 30th, 2008 at 9:12pm  
Thats really not a solution.

Have your provider give you a public IP thereby disabling all NAT functions.
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Reply #8 - Apr 1st, 2008 at 4:54pm  
I have heard of a situation when the iDirect modem was running NAT in which a problem on the LAN created a situation in which close to 1000 DHCP address assignments were made which brought the modem to its knees.  An infected PC or something made repeated DHCP address requests and killed the modem. 

Moving NAT off the iDirect modem solved the short term problem, but there was still an infected PC that had to be run down and fixed. 

The 3100 does have limitations with regard to the number of 'active' TCP sessions.  iDirect officially supports about 1000 TCP sessions on the 3100 (although it will generally work with more unless there is something else eating up resources). 

I don't understand why you aren't working with your provider to solve this problem.  iDirect network operators should have access to the iDirect TAC for assistance.  If your operator has not purchased technical support from iDirect, then you should switch to another operator.
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Reply #9 - Dec 15th, 2010 at 7:31am  
True. We are facing the same problem with some customers. It's all about the NAT sessions.

iDirect 3000/5000 series can handle up to 1024 sessions, after that all the extra packages will be dropped.

To check if it's NATing problem or not, connect to your remote or Telnet from the iMonitor and enter the following command:

nat stats

If You see sessions below 1024, you should have zero dropped sessions and your problem related to something else, otherwise you will see that your modem is dropping packages!
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Reply #10 - Aug 10th, 2011 at 2:54pm  
They can either clean their PC or connect a router and change the iDirect mode from NAT to Bridge mode
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