Comcast - Align IP Addresses Using Wireless And Ethernet
Feb 7, 2013
I work in small office with four users and we use Comcast as our ISP. A separate room from the office has our cable modem. The cable modem has a Ethernet cable going to a WRT54G WAN Port. The WRT54G is not being used as a wireless router.Coming from the LAN ports is a Ethernet cable going to a Netgear switch.The office has Ethernet ports and one of them is hooked up to a Netgear WDNR3700 wireless router. All users are utilize the wireless network to get online. There IP Address is 10.0.x.x. When I use a Ethernet cable to a computer my IP Address is 192.168.x.x.
What needs to be done so the IP Addresses of the wireless network and wired network use the same IP Address range?
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Jan 17, 2012
Just got home from the Comcast store with a $7 rented modem just to last me until I do research and purchase one. I realize that this modem has only one Ethernet port with no WiFi support so I have another PC and a laptop sitting idle because there's no internet access. Did a quick search using Comcast's authorized modem's list and all of them only have a single Ethernet port and no WiFi. Is there a modem with multiple Ethernet ports with built in WiFi? I am getting almost 20mbps with a download speed of 4mb/s which is a HUGE improvement over my ATT DSL service that I've had since forever at 3mbps with a download speed of 300kb/s. I have no idea what technical specifications to look for in a cable modem to get 100% of full potential speed from my service without disconnects or other various problems.
I have a ATT U-Verse router sitting here right now, I am wondering if I can somehow connect it to my Comcast modem. I tried to connect the ATT router into Comcast modem via Ethernet cable, but I couldn't get past the "Your DSL service is unavailable" in the browser, but in my desktop system tray, it shows I am connected to the internet. If I could use this router, I would rather spend money on a modem instead of getting a combo.
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Dec 22, 2012
We have purchased Comcast fiber EDI services. They run a fiber to our office and connect to a Ciena 3930 switch. The speed we have is 30 down and use for Internet. Comcast provide a /30 and /29 address. Do I need an additional router to route /30 to /29? I only have a PIX firewall.
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Oct 8, 2012
In setup for old RV042 (V1), when updating / adding Mac addresses, the table is always sorted by IP addresses. But in the new oneRV042 (V3) I have, even with latest firmware 4.2.1.02 the list is random, thereby increasing the chance of user entering DUPLICATE IP addr with diff Mac addr. That will result in conflict.If the firmware sorts the DHCP entries by ip addresses, user would be able to catch duplicate ip errors even if the system does not flag the errors. All Cisco smart engineers can you all get the dhcp entries SORT by ip addresses.
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Jul 13, 2011
I just got Comcast at my house and I'm having major problems with my wireless speeds. I was on Frontier until today and both the wired computer and the wireless would download at the same speed and have the same ping. Today, after comcast, the wired computer is downloading at about 70 megs a second, and the wireless is at about .3 megs a second. I turned off the security (I'm in the country, no security needed) and changed the channel. I went to ASUS to get the newest wireless driver...
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Feb 17, 2013
When we got broadband through our cable provider (Comcast), we were sold a single user license even though we were explicitly connecting two computers.Upgrading to a multi-user subscription (for up to 5 connections) solved that.I'm currently trying to configure 4 computers to connect. I have noticed that if a configuration for one has WPA and another has WPA-2 they will bump.This may be true for differences in WEP-keys, TKIP setting, etc. If you do new configurations, the settings may revert each time to a default, which you may not notice.Keeping the network settings matched may work. Using a portable memory device to run a saved configuration on each machine can improve their synchronization.
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Jul 10, 2011
We have Comast internet using an Arris modem and have a Netgear wireless router. We have our modem hooked up to a desktop computer that we don't even use. We have three laptops that we us with our wireless.Comcast has told us that we have to have the modem hooked up to the desktop for the internet to work.what do people do who have only a laptop and have wireless internet in their house?Is there anyway to get rid of the desktop and have the modem hooked directly to the cable and router?
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Jul 10, 2012
Just got a never used AT+T Wireless Router (2701HG-B Gateway) from a friend to use with my laptop and comcast broadband connection. I have windows vista, and use IE as my main browser. Can I used, or is it set up to only work with an AT+T connection? I do have all the software discs that came with the unit, but haven't run them as they seem mainly for setting up DSL connection with AT+T.
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Jul 26, 2010
I have tried to connect Comcast to my new E2000 router, with negative results. I did perform the firmware upgrade on the router (to 1.001). My old Netgear WiFi router works fine, so I know the configuration works.For testing purposes I have the following:
MacBook Pro > E2000
Comcast > E2000
Both via Ethernet cable.
I do have access to the E2000 via web based interface. I have tried a variety of configurations, including the use of the "static" configuration using the current Comcast ip, gateway, subnet and DNS that currently exists. I am unable to get the Auto DHCP to work - Comcast ip's do not appear (in the "status" window.)
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Mar 28, 2013
Region : UnitedStates
Model : TL-WR1043ND
Hardware Version : V1
ISP : Comcast
I'm sort of used to everything failing every 2 days when a new device shows up due to the DHCP timeout issue that I've posted a workaround to. However, after rebooting everything, NOTHING worked. At all.I could get to the Admin page too.The DHCP address to my Comcast modem was 0.0.0.0 etc.The TP-Link "Detect" feature started saying Comcast was issuing me a "Static IP" instead of "Dynamic".Now, I can get an address from the Modem to my PC.So I cloned the PC's MAC ID.If I reboot the TP-Link 5 or 6 times, it might pick up the Comcast IP once, but no routing happens to the internet.I did try putting the static IP address into the TP-Link to see if I could fake it into getting online temporarily, but no.
And... after hours of troubleshooting last night, the router will not hand out DHCP addressed to any LAN equipment any longer either.Even, if I plugged in my laptop (which worked on the Comcast modem), the IP address it received from the TP-Link was the Comcast Public IP!Not a NATed / DHCP IP address! so I Factory Reset the TP-Link via the Admin page AND via a paper clip at least 4x.There were also no thunderstorms. Both the router and the modem are on a UPS / surge protector.The house is not (usually) haunted.I did try the new Beta firmware but that didn't fix anything.I also "upgraded" to DD-WRT.
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Apr 7, 2013
We have kids in the house and I'd like to limit their internet access to certain times of the day but because of the great amount of devices they use (phones, tablets, laptops, etc.) the only way I could think of doing that easily was to set up two wireless networks: one that the adults could use 24/7 and the other that the kids could access during certain set hours.
Here's the equipment I'm working with:
DLink DIR 615 wireless router
DLink DIR 515 wireless router
Motorola Surfboard cable modem S85101U
I plugged the DLink 615 in, set it up for DHCP client and plugged it into the cable modem. I lef the default 192.168.0.1 IP address for the device. On that router, I also reserved the 192.168.0.199 IP address and assigned it to the DLink 515.I also gave the DLink 515 device the IP 192.168.1.1 so I could administer it.I set the DLink 515 to static IP and made the IP 192.168.0.199 and the default gateway 192.168.0.1.I plugged the DLink 515 into one of the LAN ports in the DLink 615.I set a schedule on the DLink 615 to shut down internet access to the DLink 515 at a certain hour and turn it back on at another time.Everything seems to work ok, but at least once a day we have to unplug and plug the routers to reset them.
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Sep 21, 2012
I bought this wonderful voice gateway off the internet from someone. So not sure if they ever used it with Comcast.So far I hatve had no internet once I plug it to the cable. I have asked Comcast tech for activating this device. However they say it is not supported and they have tried sending it the Activation signal but they say it fails. I can see all lights lit up and go green when I connect this device to the cable, is there a firmware upgrade for DPQ3925 ?
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Oct 16, 2009
My router worked fine. Comcast did updates and now it wont work. If I connect the cable modem to the laptop the internet works fine.It's the router. She said I need to reconfigure it. I tried looking on the site, typing in the 192.168.1.1 thing and the password "admin" is not correct.
My cable modem is Motorola SB5120. My linksys is WRT54G2 V1. how to reconfigure this to work! We work from home and this is a huge obstacle for us to not have wireless internet
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Apr 28, 2013
I have xfinity internet with a comcast rented modem connected to a personally owned belkin router. I can successfully connect to the internet directly from the modem or if I connect to the modem to the router and then to my computer via ethernet cable. I cannot for the life of me connect wirelessly with any devices. The router previously worked when it was hooked up to comcast internet, but it was moden->router->my router. When I connect wirelessly on my Windows 7 laptop, it says I connect and that there is internet access. But when I try to load a page it takes me direclty to this website: url.. Comcast says that it is my router that needs configuring properly with xfinity and wants to charge me $39 to provide this wonderful service.
Router: Belkin Model F6D4230-4 v1 with firmware F6D4230-4_WW_1.00.03
Modem: Comcast Model RCA DCM425
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Jan 24, 2012
I have a problem with my E3200 that has happened at least 4 times since I first purchased, installed and configured it. Initially I thought it might be something with Comcast, but a) I never had the problem with my Linksys WRT54G router and b) It seems I can now duplicate the issue by saving a config file and restoring it.The specific issue appears to be somewhat random. At some point the connection to the Internet simply stops for no apparent reason. I am able to ping the router and connect to it. I am also able to drop and renew connections to the cable modem successfully. Furthermore, I can ping my network side of the router, as well as the external address handed to my router by the cable modem, and the cable modem gateway address, but still no connection to the Internet.The only solution to my problem has been to restore the factory defaults to the router and reconfigure it from scratch, which does seem to fix the issue for a time until it occurs again. FYI, I do not use the Cisco connect software because I have several custom port and QOS configs that are necessary for an IP Phone and other hardware on my network.
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Jan 12, 2010
I have a need to have 2 seperate networks from my comcast cable modem.I was hoping to plug a 5 port hub into the cable modem and then plug both the wrt610n and the wrt54g into the hub. Seem that only one of the routers will get an ip assigned from Comcast.Is there a way to have one ISP cable modem and create two different home networks with the two linksys routers, thus two separate independent networks?
-Network 1: public household use and family (Jane's wireless laptop, household PC's etc).
-Network 2: private household/company use and separate from the public family network (company wireless laptop/company PC, un-secure media server).
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Apr 18, 2012
I just recently purchased comcast internet today and self installation kit that came with the modem and all..... got it all set up no problems activated did speed test directly from cable modem to laptop computer wired and was getting 10mbps down and 3mbps up well went out and bought a linksys e900 wireless router.... connected it no problems... however my laptop wireless and phones connected to the router with speedtest is only getting 300kbps down average!!! but the upload is still 3mbps.
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Jul 23, 2011
I am setting up a e4200 wireless router on a Comcast business account that uses a gateway (SMC8014).I have fixed public IP [x.x.x.x/30] and the gateway sets up a subnet 10.1.10.0 (255.255.255.0). I have mail server and DNS server at 10.1.10.20 and I use port forwarding in the SMC gateway.
The setup of the e4200 using the software sets up a network (192.168.1.1). I can connect devices to the router and browse the external Internet. However, when my android phone connects to the e4200 it gets an IP such as 192.168.1.101. However, I cannot download my mail which is at 10.1.10.20. When I try to browse that IP from the android phone I get the SMC gateway at 10.1.10.1 and not the computer at 10.1.10.20. If was coming in from the external Internet port forwarding would take over but it does not work for the android phone connected to the e4200.
Also, i noticed that when I set up the default setup for the e4200 the "Cisco Connect" says the WAN address is 10.1.10.155 and the LAN address is 192.168.1.1. However, when I go to the SMC Gateway and list the connected computers it doesn't see the e4200 at 10.1.10.155. If I set up the e4200 within 10.1.10.0 then the SMC sees it (but the computer name always says "unknown"). It I set the DHCP in either the SMC or the e4200 within the 10.1.10.0 subnet I can see the phone connection in the SMC when I list the connections but any requests to 10,1,10.0 computers goes to the SMC gateway.
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Apr 25, 2013
Currently have a linksys wrt54gs connected to an Arris TG852G/CT. Currently getting poor speed via WIFI for Comcast Xfinity service. The Arris modem is connected directly to the Linksys Wireless Broadband Router via Ethernet. It lists the linksys broadband router as unknown device and does need utilize the 54 mb/s g standard available on this device. I have updated the firmware to 1.52, reseted the Arris gateway to factory defaults, and reset the linksys to factory defaults as well. The IP address is 192.168.1.1 for the linksys/ 10.0.0.1 for the Arris gateway.How do I improve connectivity between the Arris Gateway and the LinkSys broadband router (model WRT54GS ver 6.0)
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Jan 5, 2011
Hard wired network (15 workstations.) I had a dsl modem connected to my network switch and linksys wrt54gs router connected to that modem. All hard wired workstations had internet access AND there was a wireless internet connection. With any wifi device I could access the internet.I switched from dsl to comcast. All hard wired work stations still have internet. but when I plug my wireless router into the modem (comcast business IP gateway) there is no wireless internet connection. The hard wired workstations can still get online and there IS a wireless network, but it does not allow internet access (page cannot be found etc.)
Comcast says it absolutely should work. Linksys says it requires simple reconfig of router settings (reset router, clone mac address.) I have read knowledge base articles from linksys and followed each step. The lan ports of the modem are all working if I connect to them directly with a laptop and cable. I have reset router multiple times, cloned mac address, dhcp release/renew.
My physical connections are correct. In the router set up utility, I can see the mac adrdress and ip address but can't tell if the IP is from the modem or the router. Default gateway is always 192.168.1.1 in the router AND in any workstation ipconfig screen. Ip addresses are 192.168.1.xx in ipconfig at any workstation AND in the router set up status.
I cannot access internet via router even if plugged directly into it. It is as if the router is not getting the correct information from the modem. However, it worked perfectly with the DSL modem the day before we changed.My workstations are all hard wired and work. I simply want to have Wi-Fi also... for phones and laptops w wireless etc.
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Mar 23, 2011
Every day for the past week my Internet access goes down. I have a netgear router connected to Comcast modem. I have to reset the modem then the router constantly and it gets irritating. I called comcast and they say reset them. But why should I have to constantly reset.... Sometimes I just ignore it and it comes back up later... what is going on??
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Aug 9, 2011
Comcast had us unplug our modem in order to upgrade to their new faster speed. now our wireless router won't work. We've reset the router twice. we can set up the wireless network but we cannot connect to it. The connection last for about 5 minutes and then we get an error, cannot read IP address. Comcast says it is not their problem and linksys says they can't assist either.
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Jun 11, 2012
I just got a new Xbox today, and use the integrated WiFi card. I was lagging like Crysis 2 on a 6800 GT (forget it). I just got a CAT .5 cable, and plugged it into modem/xbox and IDK... it works, I'm online, but basically my question is:Does ethernet connections have less ping (better) than wireless connections? This is with the Xbox 360 Slim. I know it improves upload, and download, but what about ping?
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May 30, 2011
where do I find my wpa or wep number?
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Sep 11, 2012
I have had comcast for 4 years and for the last two years my comcast connection had been dropping. At the time I didn;t take it as a big deal because I have bad connection but not it's way too frequent to ignore. I have gotten a new router and exchanged a modem from comcast. Basically at a random time of the day internet just goes off. To fix it, I have to go up to the router and disconnect and reconnect the router. Even sometimes it doesn't fix the connection so now to fix the dropped internet everytime I do the following procedure: Unplug ethernet cable from modem --> Unplug the modem --> unplug the cable that connects the modem and a Y-extension for TV and internet
Motorola modem: (new one)
Software Version: SB5120-2.19.0.16-SCM00-NOSH
Hardware Version: 1
MIB Version: II
GUI Version: 1.0
VxWorks Version: 5.4
Cisco E-1200 v1 router (new one)
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Dec 15, 2012
We can not get our PS3 to stay connected to the internet. We have Comcast and a Belkin router. We were told to clone Comcast's Mac Address to our router.
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Oct 17, 2012
I'm looking to upgrade my SB-5100 Motorola Cable modem that I now rent from Comcast. My main objective is to increase my internet performance.
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Jul 31, 2012
I have a 'Comcast Business Gateway' a friend gave me and I would like to use it instead of the regular gateway. The business gateway has extra Ethernet ports on the back where as the regular gateway just has one for your router. I plugged in the business gateway and I couldn't access the network. I used 10.1.10.1 which I thought was comcast's default but to no avail. I am not a tech so I am now stuck.The whole reason I am trying to do this is because the wireless routor is in the house, with a ethernet wire running to the shop. This distance is about 60 feet. I have the computer pluged into the wire but I can't get the printer or the other computer to connect to the wireless. I would like to connect the Business Gateway to the house wireless and then run the hard wire to the shop and connect another wireless router to the wire and run the shop on its own wireless. I tried one of the wireless extenders and it does not have enough juice.
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Oct 13, 2012
My mom just got comcast internet for the restaurant but I can't log in to it with my laptop because i dont know the network security key i looked under the smcd3g-ccr router but no network key only find theses labels, Model Name, Smc P/N, P/N, S/W Rev, H/W Rev, R/F Mac, Wan Mac, S/N, and Iden:1033, But no network key or wep label. I tried logging in the router with default gateway 10.1.10.1 and entered cusadmin for login and highspeed for pass and in the router there is no wireless tab, NONE, so I can't find the ssid or wep key ill show you a picture for the homepage [url]...
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Jun 14, 2011
I have had a wireless LAN in my home for a couple of years now and it's always worked great. I could download a 10MB file in less than a minute. Then I moved one of my computers & Wii to the other side of the house & now I can hardly get Google to load. My wireless adapter utility says I have only one "bar", and the signal strength is about 20%. Often it drops the connection altogether. I've tried the Wii, and another computer in the same location and they have a very poor connection as well. To make things even more confusing I can get a sporadic burst of speed that will sometimes last a minute, sometimes an hour. I have a Linksys WRT300N router with Comcast cable service. Is there any way I can boost my signal strength? Is there even such a device?
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Jul 12, 2011
tried 2 routers, one brand new , both DIR655 from Dlink - an older router. Just got a Comcast internet connection. The internet is fine when connected to the laptop directly. The router can talk to the computer. but plugging the internet cable into the router, the router never quite finds it, ie the blue indicator light never indicates access from modem to the router. So cant get that extra protection from the router, or the convenience of it.
By the way I am doing all of this hardwired even though the router is wireless capable. I did a hard reset which I could log on and see worked of the router. This happens when it is not hooked to the computer. I did the thing of powercycling modem and router, no change. Do I need a newer router? Is there something weird about Comcast, these were fine w Cablevision. Comcast tech support was useless.
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Dec 9, 2012
I bought comcast xfinity internet about a month ago, and I cannot get any upload speed. It's jammed up at about .40, and I'm paying for 3-4 mbs. My plan is 15/3, but the download speed is always over 20 mbs, while the upload is .40.
Comcast has been here twice with two new modems, and ran brand new cable under the house, because they said the signal was weak. Now it's strong, the modem is fine, and there is STILL no upload. I can barely upload pics to photobucket. Comcast basically told me there is nothing wrong on their end, and there is nothing they can do. The signal is strong, the modem is fine, the cabling is fine, and they are providing their service on their end.
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Feb 26, 2011
I had recently switched to Comcast Xfinity Blast internet. I ordered the service with 22 mbps. Now when I download something, it becomes a challenge for the download to get faster than 500kbps. I don't understand, It should be a lot more. If it stays at this rate, than there would be no difference between my current and previous service.
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