Cisco WAN :: C2950 Vlan From Switch To Router For Cable Modem

Jun 25, 2012

The current setup is as follows: Virginmedia Superhub in modem mode connected to  one Cisco C2950 on port fa 0/23. The 2950 is connected to a Cisco C3550 over fa 0/24 via normal Cat 5e.Port fa 0/23 on the 3550 have a Astaro/Sophos UTM connected to it that acts as a Firewall/Wireless controller etc. The hitch, or maybe one of them, is that the 3550 and the UTM is on another floor from the 2950 and cannot be moved. The Virginmedia superhub can't be moved to the other floor either due to limitations in the cabling.What I'd like to achieve is for the UTM to pick up the public IP from the Virginmedia cable modem whilst no other devices on the Lan should be able to connect to the cable modem. All inbound/outbound internet traffic should go through the UTM for security reasons. The UTM have a number of available nic's that can be set to dhcp, static etc. I already have a number of VLANS on the router/switch and have half a suspicion that using another VLAN for this purpose might be the way forward but I'm not sure..

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Cisco WAN :: C2950 - Monitor Port Where Modem Is Connected From Host?

Jul 22, 2011

I have build topology like this:
I wanted to monitor c3560 port where modem is connected from host. So for that I configured rspan. configurate show below. But problem is that after configuration f0/4 of c3550 remains up and f0/3 of c2950 goes down. WHen I look at status of f0/4 it show "FastEthernet0/4 is up, line protocol is down (monitoring)". I tried to search websites It seems configuration is fine.


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May 19, 2011

I have Multiwan router with 1 port WAN and 4 DHCP Cable modem connected to SF 300-8. I want to connect 4 modem via VLAN through switch. I define Vlan2,3,4,5 on router also in Switch. port 1 on the router as trunk and the other port 2,3,4,5 as Vlan2,3,4,5 with VLAN mode Access. I tag port 1 on every VLAN also Untagged for each port. I having problem when I check the status from multiwan router. all IP address is the same (duplicate). what I want is each VLAN has own DHCP Address. Is that any miss configuration ?

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May 7, 2013

I am trying to configure interface vlan1 to get an ip address from dhcp by entering the commnad ip address dhcp ios rejects the dhcp portion of my command as not recognised although it is referred to in Cisco IOS version is c2950-i6k2l2q4-mz.121-22.EA14.bin.I get the same problem when I try to configure ip http secure-server on the switch. Is this a known bug or whether I have the correct IOS version for these commands?

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Oct 25, 2012

The network card in my PC supports 1Gbit ethernet, my 2TB NAS also supports 1Gbit ethernet, however both of these are currently run through a 100Mbit cable modem/router thus reducing the connection speed. I was wondering if I purchased a 1Gbit switch and connected all my devices directly into that, then connected it into the cable modem, would the PC communicate with the NAS directly via the switch or would it go through the cable modem?

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Feb 6, 2011

How may I connect 2 PCs to a Cable Modem via a TP Switch? Only 1 PC has net connectivity while the other one shows invalid IP address problem.

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Cisco Switching/Routing :: Unable To Connect A Wi-Fi Modem Within 2960 Switch Having VLAN 1

May 19, 2013

I am unable to connect a Wifi Modem wiith 2960 Switch having VLAN 1,Attached is the network diagram,what configurations i have to modified it,I need to Connect A Wifi Modem on VLAN 1 ,Connectivity is working fine between VLAN 10 and VLAN 1.What should be the next step to Connect Wifi Modem to VLAN 1 so that Users on VLAN 10 should connect to Internet.

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Cisco WAN :: Connecting Cable Modem Through 3560 Switch?

Apr 12, 2011

I have a 3560 series switch and two comcast cable modems. I connected the modems to them switch via cross over cables and set an OSPF routing on their subnets. I connected my wireless router to another port of the switch and set its gateway IP on the switch port. I can ping the modem with the switch and I can ping the wireless too. But I cannot access to the Internet via the wireless router.
I need load balancing on two cable modems and get a single network connection via the wireless router.

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Netgear FS726T Switch And SMC Cable Modem Connection?

Jan 27, 2012

I am relatively good at installing and troubleshooting smaller sized networks... I am having trouble with one of my customer's networks and I think I have the problem narrowed down. r issues.I have a customer with a FS726T switch and ~20 computers connected to this switch running DHCP assigned addresses.The switch is assigning addresses in the 10.0.0.xx rangehe customer currently has an old T1 line coming into a Cisco router, which then directs traffic to port 20 on the switch.The problem is, we are replacing the old T1 line with a newer 50mbps cable connection.The cable company pre-configured their router with a static IP address the 68.116.xx.xx range. The Subnet is also different than the Netgear's subnet. I would like to keep the old T1 connection in place. I believe they have data that needs to go to their mainframe/backbone server at corporate.

I cannot log in to the cable modem. IT is an SMC SMCD3G with a staic IP. I tried changing my PC's IP address to the same gateway but cannot get into the cable company's modem, even using a static IP with the same gateway as the modem's gateway address. I don't want to reset the modem/router and lose the cable company's settings.I am pretty sure for the devices to communicate, the following has to be true?:1) Cable modem and FS726T must be on the same 10.0.0.xx IP range?2) Cable modem and FS726T must be on the same subnet mask?

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Dec 6, 2006

how to switch AM200 adsl modem to AnnexB mode, in Slovakia working only AnnexB

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Linksys Cable / DSL :: Can't Get A New IP From ISP When Cable Modem EPC3925 Is Set To Router Mode

Mar 23, 2012

I can't get a new IP from my ISP when my Cable modem router(EPC3925) is set to router mode, i have tried factory restore, unplugged etc..but still no luck. It changes each time i reset it when i set it to bridged only mode but then i won't be able to connect other devices to it since it doesn't uses DHCP in bridged only mode. It changes back to the IP i had when i set it to router mode. I don't want to change my router settings to bridged only because it would disconnect the other devices in my house. Why my ISP assigns the same IP address when it's set to router mode but assigns different IPs when it's set to bridged only, how is this possible ?

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Feb 7, 2012

I have a cable modem installed to my property but want to use my modem/router to go wireless. The proble is my cable modem output is a RJ45 and the router input is RJ11.

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Why Router Work With DSL Modem But Not Cable Modem

Jan 6, 2013

I'm switching to cable internet service instead of DSL. My Netgear router will not work with my cable modem; but it works like a charm with my DSL modem. Is it a problem with the router setup? Good thing I still have the DSL service.

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Apr 26, 2011

I have a siemens gigaset567 unit.I suspect others are accessing via vlan.

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Cisco Switching/Routing :: 3750 - Extending VLAN To Remote Switch That Already Has VLAN ID In Use

Jan 10, 2013

I have two networks at two sites with a dot1q trunk between the two L3 switches at both sites (no routers involved)
SITE A - Cisco 3750 L3 - VLAN ID 50
SITE B - Cisco 3750 L3 - VLAN ID 50
I would like to extend the SITE A VLAN to SITE B so that I can move hosts from SITE A to SITE B without needing to change their IP address but the vlan ID is already in use. Obviously the easy solution is to change the VLAN ID for one or other of the sites but both sites contain hosts that run 24/7. Is there a way to join two VLANs with different IDs together.So for example I create a new VLAN 60 at SITE B and associate it with VLAN 50 at SITE A.

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Aug 23, 2012

I have a pc running windows 7 connected to a broadband modem. From that modem I have a LAN cable running to another building plugging into a wifi router. I have 2 pcs running xp plugged into this wifi router. (they can see each other)Is it possible for the 3 pcs to see each other on the network?The only way I got it to work was if all pcs were connected to the same modem. However to save running super long cables for each pc I want to run just one between the modems and then plug all pcs into that wifi modem which is close to everything.

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Cisco WAN :: 3560 Switch Vlan And Router Configuration?

Feb 10, 2012

In our new Head office we have to set up a Network connectivity.Total our office 4 floors.In each floor we kept  three cisco 2950 switch.We have L3 switch(cisco 3560) to connect the all the other switch.In our office total 5 departments.we have to create VLan for each departments in the switch.
We want to all user to communicate to each other.We have WAN connectivity in the router(cisco 2900) to connect the other office.First i want know how to physically connect all the swiches and finally with  the L3 switch.How to configure the VLAN in both L2 and L3 switch.In our other client office one router to connect the both office.In the router how to configure and which protocol to use to communication.
Ip address:

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Cisco WAN :: SG500-24 - Switches Between Cable Modem And Router?

Feb 25, 2013

Currently, my Cisco DPC3010 cable modem is connected directly to one of the Ethernet ports on my Linux router.  All works quite well that way.  However, I'm curious to know if there's some what to separate the router and cable modem over 2 switches?
The coax enters the house in my living room and connects to the CM there.  The router is also sitting in the living room, and it's connected to a Cisco SG200-18 switch.  I have Ethernet running from my living room to my basement, where a Cisco SG500-24 switch sits.  The two switches are connected via a 2xGigE port channel.
I want to move the router into the basement.  Ideally, I'd like to move the CM down there with it, but I don't have the necessary coax run.  So for now, that's out.  But... can I go from something like this:
--coax----- Cable Modem ---GigE----- Router ---GigE---- SG200-18 ===2xGigE==== SG500-24
To something like this:
--coax----- Cable Modem ---GigE-----  SG200-18 ===2xGigE==== SG500-24 ---GigE----- Router
I tried it, complete with a separate VLAN specifically for the CM traffic.  And the VLAN was properly trunked between the two switches.   But for some reason, the router was unable to communicate via IP to the upstream.  I'm not sure if there are config bits I need to set on the SG200 that the CM is connected to?  I thought I'd read somewhere that CMs don't like broadcast technology such as LLDP and/or CDP, so I disabled both of those on its port.  Did I miss something else perhaps?  Or am I trying to do the impossible?
For what it's worth: the IP connectivity is static.  There's no DHCP running between my router and the upstream cable provider.  The cable modem is literally acting as a L2 coax-->Ethernet convertor, more or less.

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Aug 29, 2012

I have a CAB-OCT-V35-FC cable in my Cisco 7200 router and not all of them are utilized. I have to connect another site with a point to point leased line and I am planning to use one of the ports in my Cisco 7200 router which is using the CAB-OCT-V35-FC cable. My problem is both the cable end and the modem is V.35 female connector and both are DCE. I need to build a crossover cable of V.35 male to male which will connect the Cisco 7200 router and the modem.

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Dec 13, 2012

I have a modem Scientific Atlanta 2100. I just installed windows 8 pro 64bit and when installing the driver to use the usb cable modem does not recognize it and simply not installed. I wonder if it is possible to use my usb cable modem or simply incompatible with my windows 8 64bit pro.

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Apr 23, 2013

With this modem, can you hook up to the Linksys Smart Apps WiFi?

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Belkin Router Will Not Connect To Cable Modem?

Aug 6, 2012

Last week, a big storm rolled through my town while I was out of the area on business. I had a working LAN/WLAN for my home & home office, and the modem I was using got fried by the storm. Strangely enough nothing else was affected..Anyway, I went out and bought an identical modem, and had it set up with Comcast. If I connect directly to the modem, everything works perfectly. But when I try to attach my router to the new modem, I have no connectivity over wifi OR hardwired to the router. According to the status light on the router, it can't find a connected modem.I reset the router back to factory settings, installed the newest firmware, and moved my DHCP pool out of the default range. I then power cycled the whole setup - twice - with no success.

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Feb 22, 2013

What the best/fastest cable modem/router device is? I currently have a motorola surfboard sbg6580. It works good, but it interferes with my direct tv so I can't use it and need to find another....

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Jan 9, 2012

I bought an ASUS Black Diamond Dual Band Wireless-N 600 Router (RT-N56U) to upgrade from my older router but I'm having a problem: It won't connect to my cable modem (via the WAN ethernet port), so I can't connect to the internet. [URL]

When I connect the router to my computer via ethernet cable, the light on the ethernet port of the router comes on (an orange LED light), but when I connect my cable modem (or computer) to the the router through the WAN ethernet port, the WAN port's LED does not come on at all and I keep getting an error message on my browser saying that I need to make sure the ethernet cable is connected.

I've tried three different ethernet cables, including the one that came with the router, with no luck (WAN LED lights never come on, so I assume that this means that there is no activity at all). I've also tried cloning the MAC address, restoring to factory default, updating the routers firmware, and holding the reset button on the modem for 15 seconds, among other things.

Also, something that might be worth noting: While one end is connected to my modem, if I plug the ethernet cord into one of the 4 ethernet ports on the router, the green LED instantly turns on but, as I said before, there's no activity when plugged into the WAN port. My modem is an Arris TM052G (DOCSIS 2.0) provided by my ISP, Time Warner Cable.

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Jun 4, 2011

My New comcast cable modem will connect to the internet, as i am connected to it by ethernet right now, but my netgear router will not recognize it and get a link to the internet to get my existing LAN back up.

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Nov 27, 2011

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Jun 27, 2012

I updrade my wireless router from 54 mpb to 150. Now my pc/router isn't connecting to the modem. How do I correct

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Jun 6, 2011

i'm trying to connect to my wii n my laptop. i have a cricket broadband hookup to desktop.

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Jun 13, 2011

I've been having problems with the router portion of my cable modem router. I have a brand new router that I would like to use rather than the crappy router that is part of the cable modem.The problem is that I'm not able to get online no matter how I set the settings. I have disabled DHCP in the cable modem router and am connecting this to the router thru the internet port of the router.

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Jan 24, 2012

I have a cable modem with my 2600 Router and i have a little speed problem when I'm going out to the web via my F0/0.. according to regular speed test sites my speed is around 20mbps but when i hook up to my modem directly i get a solid 40mbps.. now I've changed my Cat 6 cable from my modem to my router and this are my settings in the router.

[Code] ...........
I see some drops and lost carriers but not sure what those might mean?

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May 2, 2011

we were happily getting along with our RCN cable Motorola modem and DLink wireless 655 until the last couple of weeks. The internet would intermittently not be available, without warning. First couple of times we power cycled the modem and router, and it worked, but then stopped being available altogether. I got some support from RCN, the cable provider (they own the modem and it's old, so naturally that was my first thought). I now have a new modem and the situation is exactly the same. The error message that I get is that the IP address for the network cannot be found.

I got internet access by bypassing the router, connecting the modem directly to my (Windows XP) PC, releasing and renewing the IP address, and power cycling the modem. However, the internet still intermittently shuts down, and of course turning off the computer necessitates the whole procedure again. And now we have no wireless. Should we assume it's the router, and a new one would solve our problem? Of do we just need to reset the IP address of the router?

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