Why is it necessary to power cycle DSL router?

By netforce ·
Often times if your unable to access the internet and as a last resort you'll need to power cycle the DSL or Cable router to obtain a new lease or what have you.

My question is whats the difference between repairing/running release renew on the nic adapter
and then having to do that at the hard ware level of the DSL router?

Your help appreciated.

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This is a great question

by tintoman In reply to Why is it necessary to po ...

And I hope someone gives you a definitive answer to it.
I always put this down to the fact that there is constantly squillions of data bits passing through a router in several directions at once, and it is inevitable that data collisions will occur fairly frequently.
Therefore powering down the device empties all the dead bodies and gives you a fresh start in effect.
The difference between this and ipconfig /renew is that all you are doing is getting a new ticket for the party, it doesn't mean you will be allowed in when you get there.
Hmmm I hope you can make some sense of that

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It's all about the cache

by robo_dev In reply to Why is it necessary to po ...

There can be several problems:

arp cache hosed/full
routing table hosed
forwarding database of switch hosed
ISP route or DNS becomes invalid before DHCP lease expires.

The bottom line is that the router has memory, and the contents of memory get full and/or corrupted. Don't rule out that the OS and router software that runs the router can have issues such as memory leaks, stalled processes, utilization issues, etc.

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Along that line of thinking...

by shardeth-15902278 In reply to It's all about the cache

I have seen apparent issues with the NAT implementation on some consumer grade devices. The NAT table get overloaded and connectivity goes to pieces.

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On occasion it's just the Linksys router to cycle

by netforce In reply to Along that line of thinki ...

Great, thanks all.

Here's another one; I've noticed on some occasions that I need to power cycle my Linksys router "only" and I'm back online.

Perhaps the cache is corrupted on my router?

This happens about 3 times a week.

I need to get a more fundamental understanding of how this all breaks down.

Thanks all.

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Age of Equipment

by TheChas In reply to Why is it necessary to po ...

I spent many a month cycling power on both my DSL modem and my Linksys router. Finally, one day cycling the power on neither device would restore my connection. Within a few short months, I ended up replacing both the modem and the router after less than 5 years of service. Both just died.

After replacing both the modem and the router, I only have to cycle power after the occasional power or phone line glitch.

I suspect that either your router or modem is starting to fail.

If you only need to cycle power once a month, you should have at least 6 months of service life left. If you are approaching once a week, either device could fail any day now.

I now have a spare of each on hand should I have problems again.

One last thing, the new devices run a lot cooler than the old ones. So, they may last longer.


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Linksys router's only 2 months old

by netforce In reply to Age of Equipment I suspect something else is wrong.

Perhaps a system reset as opposed to a power cycle.

I had the DHCP turned off prior since I was using my server's DHCP to hand out LAN IP leases.

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Consumer Grade Equipment

If you are referring to loss of connection issues related to the private network and internal interface. All of the reasons mentioned earlier are certainly possible. Those reasons for the most part are caused by the quality level of consumer grade equipment.

Firmware and hardware are spec'd to many different grades/standards. Hardware has infant mortality probability, mean time between failures and a slew of other spec's that determine what grade it is. Firmware is never perfect and the closer it gets to being perfect the more it costs. I think the equipment manufacturers have to analyze the cost versus quality aspect very carefully and best guess what kind of failure rate is acceptable to the consumer.

A hero of mine Craig Mathias just posted a relevant blog about the firmware/software aspect that might be interesting.

So to eliminate more problems you have to pay more. Unless you have an individual like BrainSlayer and his DD-WRT free firmware, which elevates a consumer grade device to near business class firmware.

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The first time my cable provider suggested that to me...

by boxfiddler Moderator In reply to Why is it necessary to po ...

in relation to my cable modem I was left with the impression that some sort of minor electrical charge can build up and that this build-up eventually causes connectivity problems.

I have no idea how true or false that is. I do know that I now unplug it on a monthly basis for a brief period of time and do not experience connectivity issues that can be blamed on the modem.

Charter is my provider so who knows how much bull they feed me.

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it's true.

by Jaqui In reply to The first time my cable p ...

since most consumer cable routers / modems do not have a grounded connection, they can, and do, build up a static charge that needs to be dissipated occasionally.

remove all wires for at least one minute then rconnect will fix it, until the charge builds up again.

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Thanks Jaqui! <nt>

by boxfiddler Moderator In reply to it's true.
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