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CIsco DPC3825 TERRIBLE; How do I work around it?

G-Dunc
I've Been Here Awhile

Good Day,

 

I switched top the DPC3825 a few days ago and have regretted it ever since.

 

Using wireless internet in my bedroom (less than 30 feet with a slight elevation change and 1 interior wall away) is now not possible. The wireless signal is continually dropping off and can't be used consistently even within 7 feet.  The wired signal is continuosly dropping off with web pages regularly not loading.  All of these require a full reset and the repair is temporary.

 

My frustration tonight sent me to look up a repair. I have found forum after forum depicting the exact same issues with ZERO solution from Rogers.  This is not at all surprising and only fuels my desire to jump to another provider the moment the option is presented to me.

 

In the meantime; how do I get around these terrible characteristics?

 

I am a light wireless user with very little usage.  The most is one device streaming netflix outside of peak hours.

 

Is there a suitable third party modem that can be purchased and connected to the Rogers network in place of the DPC3825?

I have read about 'bridging' of the DPC3925 to a seperate router being possible.  How is this accomplished?

Is there other options I have not mentioned here?

 

I am a simple man.  All I want is for me to set all of this up once and have it work all the time without question and with minimal user interaction (if any).  It used to 'just work'.  How do I get it to 'JUST WORK' now?

 

Thanks

 

 

***edited labels***

1 ACCEPTED SOLUTION

Accepted Solutions

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Gdkitty
Resident Expert
Resident Expert

I beleive Rogers does not allow 3rd party modems.. you can buy the modems from them, but they have to be the specific ones they support.

In the end, apparently to fully take advantage of the 'speed boost' etc, you need to have this modem, over the stand alone ones.

This does not mean that you NEED to use the wireless part of it.

This is my current setup:

DCP3825 Modem (two cables comming out of it, one to my xbox, one to the router)

|

|

Linksys E series Router (one cable in from the modem on a REGULA port, not the WAN.. 2 to blueray and surroundsound, 1 out to switch.

|

|

Switch (connects to desktop PC, wired network printers, etc.

 

While you CAN set up wireless on both, and have it do switching between them.. unless you need the extra rang, the DPC doesnt do it very well.  I have DHCP ON, and wirless OFF on the DCP.

Then on the Linkysy, turn DHCP OFF, and configure your wireless how you want to.

Now, the only thing other than that i had to change.. i did have port forwarding set up on the linksys before for a few apps.. these settings now have to be put on the DPC, instead of the other router.
You are effectively running a wireless router, as an access point.

 

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26 REPLIES 26

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Pauly
Resident Expert
Resident Expert
why go through all that trouble? why not just get the motorola surfboard modem or scientific atlanta one port modem and use your own router?


Re: CIsco DPC3825 TERRIBLE; How do I work around it?

G-Dunc
I've Been Here Awhile

Everyhting I am reading tells me that the Motorola SB6121 is the best way to go. One can be ordered for about $100. The issue is that most the boards I have read have mentioned this is an option except Rogers will not allow them onto their network.  While I haven't found anything from the immediate past stating one way or the other whether or not this has changed it seems like a bit of a gamble.  

 

Is there a sure fire way to get a third-party modem hooked up? Has there been a policy change allowing consistent hook-ups?

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Gdkitty
Resident Expert
Resident Expert

I beleive Rogers does not allow 3rd party modems.. you can buy the modems from them, but they have to be the specific ones they support.

In the end, apparently to fully take advantage of the 'speed boost' etc, you need to have this modem, over the stand alone ones.

This does not mean that you NEED to use the wireless part of it.

This is my current setup:

DCP3825 Modem (two cables comming out of it, one to my xbox, one to the router)

|

|

Linksys E series Router (one cable in from the modem on a REGULA port, not the WAN.. 2 to blueray and surroundsound, 1 out to switch.

|

|

Switch (connects to desktop PC, wired network printers, etc.

 

While you CAN set up wireless on both, and have it do switching between them.. unless you need the extra rang, the DPC doesnt do it very well.  I have DHCP ON, and wirless OFF on the DCP.

Then on the Linkysy, turn DHCP OFF, and configure your wireless how you want to.

Now, the only thing other than that i had to change.. i did have port forwarding set up on the linksys before for a few apps.. these settings now have to be put on the DPC, instead of the other router.
You are effectively running a wireless router, as an access point.

 

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

@Gdkitty:

 

nice posting!

 

You have summarized quite compactly, and nicely,  how to overcome what seems to be the most significant technical shortcoming of the DPC3825.

 

I am sure we could fine tune your suggestions any number of ways, but you've got the basics down pat.

 

The unfortunate fact is that the Rogers DPC3825 customer should not need to do all of this to make their internet connection and the Rogers-approved and provided modem/"wireless" router perform satisfactorily to serve their needs.

 

But, alas, we do need to resort to such technical work-arounds in order to take advantage of what the technology has to offer.

 

Regretably, this is what is required.......................

 

skinorth

 

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Oh i totaly agree :).. people SHOULDNT have to.

But, MANY rogers customers... well at lease EVERYONE that i know, none of them actualy had any of the previous modem/router combo's... all of them just had the older modems.

 

So all of them, already have a wireless router.   IN the case of getting the DPC, SHOULD make it obsolete.. but other than a little bit of setup work, they are really not that different that they were before.

 

Personaly.. i actualy like it better this way.  Due to it being a modem, i would assume that rogers could potentialy get access to the router settings... this way that its on a seperate device, its seperated :)... pluss gives you SOO many more options with your router choices.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

arnym27
I've Been Here Awhile

Yes, combo models like Cisco may draw security concerns that one's PC content can be accessed by provider's staff. Not sure when it may happen in practice, but wanted to point how to improve speed and security of your multi-router setup:

 

- Reset (not Reboot) your new Cisco Gateway after provisioning by pressing hidden Reset button

- Assign Static IP to a DMZ device on Cisco Gateway

- Set that IP for your own wireless router as Static WAN IP. Hook up its WAN port to any Cisco's port

- Add 3 fast DNS server IPs to both Cisco and own router. Leave default DNS server IP as one of them

- Set "On" both DHCP Server and SPI Firewall on both Cisco Gateway AND your own wireless router 

- Connect non-secure devices to Cisco (VoIP Phone, NAS Drive, etc.) and secure devices to your own router (PCs)

- Reboot both Cisco and your own router. Enjoy...

 

When you configure your network this way , you double available number of switched wired ports, don't need to switch Off router firewalls, and will get similar speed on both routers. You will also enjoy DHCP IP assignment on both routers. Most important, your own router will work as Router (hooked up to WAN port) instead of Switch (hooked up to LAN port), because using it as a Switch on your trusted LAN offers less protection compare to WAN router port. So you better protect data on your PCs.

 

After getting mine Cisco, I realized that many customer complaints might result from not Resetting it after provisioning or  when your account was modified by Rogers resulting in new Config being pushed to Cisco. You need to Reset it instead of Reboot. Then it should work in tandem with your own router well, despite before being slow, dropping or blocking signal, etc. Its not a magic bullet and can't fix all possible Cisco's design and FW flaws, but can and should be used in initial setup. Another effective way to increase browsing speed is finding fast DNS servers on the web. You can check DNS server response time by opening Command Prompt on your PC and typing: ping "DNS Server IP Address" .

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

arnym27
I've Been Here Awhile

Just wanted to clarify that in addition to 8 switched wired ports in the above config, you can also use wireless features of both routers independently at the same time. For example, use both routers as separate Access Points, and connect closer positioned wireless devices with stronger signal to Cisco, and more remote devices with higher traffic to your own wireless router. Or use your own router as a wireless Repeater, and Cisco as Access Point. Finally, try using Cisco wireless features alone after Reset - it may work more stable as well, thus eliminating the need in a 2-nd wireless router..

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

nezhad
I've Been Here Awhile

I have solved the wireless problem of this modem by using a second wireless router as a range extender. The issue I have had ever since I replaced my old modem with the Cisco one is my VoIP service from Primus.

After a lot of troubleshooting and talking to the technical support of both Rogers and Primus I realized that the problem would temorarily go away for a day or two when I rebooted the Cisco modem. However, after a couple of days I would have to do that again because our phone conversations would be awfully jittery and choppy to the point of being incomprehensible.

I thought my router might be a faulty one so I took it back to the Rogers store and got another one but the problem still persists.

Any idea what I may be able to do? Should I go for another brand of the modems that Rogers supports such as SMC D3GN or Hitron CDE? Would using the modem in the bridge mode solve this problem?

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Gdkitty
Resident Expert
Resident Expert

Currently its NOT in bridged mode?   Is the voip box connected directly into the gateway? or is it into wireless router (access point)?  if its in the AP, i would try it into the gateway.. illiminate that one step.

 

Putting the gateway, into bridged mode, effectively, makes it just a modem.  Its worth a shot to see if it fixes the issue.  Just remember to turn DHCP back on the wireless router.

 

In most cases, overall, i have heard the smc is much poorer.  The new Hitron, while the wireless still appears sub par, i am not sure on the acutaly router aspect of it.

I am currently running the 3825, in the same setup as you are.
I have yet to run into any issues, good speeds constitantly (for gaming, etc).  But i dont use a voip system, so unable to tell you what that is like from my experiences.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

@arnym27:

 

You stated: "You will also enjoy DHCP IP assignment on both routers."  I'm not sure what you mean by "enjoy", but I would caution against having two DHCP servers on your network.  It can be made to work, but it is not necessary in most home networks, and will certainly have at least the potential to create problems.  The setup of such a multi-DHCP server setup is complicated and requires specialized knowledge and network configuration.  I would not advise doing it in a home network under most conditions.

 

The use of two (or more) DHCP servers on the same network can create conflicts between them both in terms of multiple DHCP responses and in terms of potentially providing duplicate IP address assignments to different devices on the same network.  Although it might well work most of the time, you will create the potential for some really freaky IP address assignment issues.

 

I also find your advice to enable the firewalls on both devices to be problematic.  Why would you need two firewalls in your home network????  This is not usually required unless you are setting up a more specialized network topology which includes a so-called DMZ.  In that case you would need to custom-configure the firewalls to perform the required functions, depending on their location/position on the network.  This custom configuration is well beyond what normally is discussed in this Forum, and very much dependent on the specific needs and applications running on the network.

 

So please be careful when following the advice given in arnym27's posting.

 

I would be happy to hear other comments on this.  At this time, I do not have the opportunity to do a more extensive posting on how to attach an outboard router to a DPC3825, although this has been discussed extensively by others here in this Forum.

 

skinorth

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

digitguy
I've Been Here Awhile

how to work arround it is not so easy.

 

everyone that has a combo device that already has a router needs to call rogers every day to tell them YOU just want a modem and not a combo.

 

it is absolutly stupid to rout data 2 times. what is the point of having a combo if you "disable" the router part it, if at all it can be disabled.

im so sick of companies trying to make us do what they want. no that is not how it should be. consumers say what happens, so lets start. cancel the service if you have to make a point. i did, they would not use my modem SB6120 on thier network. i found another company that would use it and it was cheaper price and more download limit.

 

so rogers smarten up ... smart people want more or no download limit and no over price bandwidth.(300gig limit is a start)

 

the younger people of today will start paying for service in the future and they will not stand for this when they are ready.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

digitguy
I've Been Here Awhile

second... if you have the extreme or express or lite service... buy this modem dcm425. after that use your own router and that is it. i just checked it is supported on the rogers network.

 

http://www.rogers.com/web/Rogers.portal?Ntt=what+modems+do+you+support&_nfpb=true&N=&_pageLabel=supp...

 

 

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

While yes you can use that modem on the network, it is only a D2 modem.

They will not be able to assign any of the newer plan codes with it, and you will only get the D2 listed speeds/caps.

I am NOT saying this is RIGHT for them to do it this way, just stating a fact as to what they are able to do on their system presently.

 

-----------------

Not everyone had the choice of droping the service.. they may not have other equivelent services available. 

 

As described in this thread, are the ways of working around this (and the other devices) currently to be able to use your own device.. no extra routing, etc as needed.
When you bridge mode the gateway, it turns it litteraly into a modem like you would have otherwise.. no double routing, etc

 

I 100% agree, that we SHOULDNT have to do this.. that a stand alone D3 modem should be available. 

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

digitguy
I've Been Here Awhile

no one has to do what i say im just giving options.

 

 

sure let the companies take over its fine i love paying more money then is needed or have to because im rich working at $14/hour.

 

companies will change if consumers make them. one person nor 1000 can do it.. everyone has too. im just saying...

 

thats it for me.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

I am not arguing that fact.. yes, its true, sometimes the only way for them to learn, is for them to loose all their customers.

Unfortunately, i would have no internet, if i did that.  So personaly, its not an option 😛

(and because i have tv and phone as well, the unlmimited internet plan, at the speed level i am at, it is actualy CHEAPER than the competitors at the equivelent speed.)

I wasnt posting to argue or anything, just to inform others who may look at the thread, that yes, they can get that modem, but be prepared for the account limitations... as well as the how they can bypass the current gateway... until rogers so chooses to listen to it customers and provide a stand alone, at least as an option.

As you said.. its an option for everyone.  Stay, Go, what hardware to use, etc 🙂 everyone has to make that call on their own.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

digitguy
I've Been Here Awhile

your funny. 3rd party suppliers are and will always be cheaper then the main companies. look it up... i did. at all speeds available to 3rd parties also the download limit... as long as the person doesnt go higher then the last 3 options its fine even with IPv6 which is not going to be fully rolled out for a while. to recover the cost of the modem the person would have to keep using for 1 year 2 months at a $4.00 per month retenl fee. IPv6 will not be done in that time.

 

but anyway we are side tracked.... back to topic which is done.

 

i have a phone line paid $110 back in 2008 and have not paid since i can call basicaly anywhere in canada for no charge. but if i choose to pay for long distance it is cheap starting at 0.01 per min.

 

dont need tv i stream everything. from the channels web sites... ie. CBS....etc

 

if people would smarten up canada, canada might be caught up with the rest of the world in price for speed and download.

 

remember the days when the internet was not around and people went outside. no internet is always an option, its not food nor water those we need.

 

its not you im just venting....

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

I digress.  For the same speed options, same service (cable, not dsl), in the last month techsavvy now has access to all rogers customers in ontario.  Their Internet is $3 cheaper for unlimited than what i currently pay.

(unfortunately, im in an area, where the bell lines SUCK, and only DSL services available are 6mb)

 

Though its likely a pipe dream... all we can hope for.. is some eventual change...

 

We never thought there would be unlimited again.. there is that option presently.
Cell phone contracts as they were, we thought would never disapear.. they have (its just hardware repayment now with flex tab)

Thought they would never allow unlocking while in contract... well thats changed 3 months now.

 

So there IS the possibility, of them making a change... MAYBE.. someday.
Hopefuly that includes the availability of a stand alone modem, instead of having to use devices like the topics DPC3825.

 

Until then.. people like me and some others here.. try to help on ALTERNATIVES to use what is currently available (for people like me who DONT have much other choice in providers).. and make it work.

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

flstf
I've Been Here Awhile

>While you CAN set up wireless on both, and have it do switching between them.. unless you need the extra rang, the DPC >doesnt do it very well.  I have DHCP ON, and wirless OFF on the DCP.

>Then on the Linkysy, turn DHCP OFF, and configure your wireless how you want to.

>Now, the only thing other than that i had to change.. i did have port forwarding set up on the linksys before for a few apps.. >these settings now have to be put on the DPC, instead of the other router.
>You are effectively running a wireless router, as an access point.

 

I did this, and it works great. The other benefit of doing this is with my DCP in Bridge mode, my connection speed dropped. By allowing the DCP to manage being the gateway, and DHCP, my connection speed is back to normal.

 

One question though, how do I access my Linksys now that it is only a wireless access point? I can get to the DCP just fine.

 

Thanks,

 

M

 

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

Gdkitty
Resident Expert
Resident Expert
Hey flstf,

I have this exact setup and it works great as well 🙂
(Was on the dcp, now on the smc, but same setup)

What do you have your linksys ip set as? It may be in conflict with the gateway.

Plug directly into the linksys (unplugged from the dcp for now) and go to its management IP address.
You will want to make sure its in the same range, but different than the dcp.

IE: my gateway is 192.168.0.1, I set my routers ip to be 192.168.0.2

Should then be able to access both 🙂

Re: CIsco DPC3825 TERRIBLE; How do I work around it?

flstf
I've Been Here Awhile

>What do you have your linksys ip set as? It may be in conflict with the gateway.
>Plug directly into the linksys (unplugged from the dcp for now) and go to its management IP address.
>You will want to make sure its in the same range, but different than the dcp.
>IE: my gateway is 192.168.0.1, I set my routers ip to be 192.168.0.2
>Should then be able to access both 

 

GDKitty,

 

Since I've turned off DHCP on the Linksys, it is being issued an IP by the DPC. I can access the DPC interface and see that the router has been issued 192.168.0.10. By even trying your suggestion of the direct connect to a Linksys port, I can't access the router. I also tried the Linksys default of 192.168.1.1, (with the DPC disconnected) but no luck either.

 

Short of resetting the Linksys, to factory default, I'm not sure what else I can do.

 

Thanks,

FLSTF

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