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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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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Jul 21, 2011
pxe server ip address is 10.10.10.20 which is connected to switch port fa0/9 and client is connected to switchport fa0/7.i have only 3 devices altogether. below is running config of switch. wen i boot the client from the server, it display error message as: "proxy dhcp were offered. none dhcp were received. exiting broadcom pxe."
Switch#sh run
Building configuration...
Current configuration : 2710 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption[code].....
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Feb 19, 2012
In one location we have a HP 2510-48 port switch which we need to connect to a Cisco 3560 switch. The problem I have is that we have issues connecting fibre to the HP switch, so I have decided to attached a CAT 5 to Fibre convertor at this end and another to the cisco switch.
My question you can not connect a HP switch to a Cisco switch, is this true or do I just need to confirgure something on the ports.
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Feb 26, 2012
what's the meaning of the output:
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/40 100M Pair A 2 +/- 4 meters Pair A Normal
Pair B 2 +/- 4 meters Pair B Normal
Pair C 2 +/- 4 meters Pair C Short
Pair D 2 +/- 4 meters Pair D Short
From the command
test cable-diagnostics tdr int gi 0/40
It's normal?If not, then. the problem is on the cable or on one of the interfaces?The interface is connected between a fastethenert on a 2811 router and a 3560-48 switch.The cable is a straight through cat 5e cable. (I have changed several cables with same result).
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May 13, 2013
Management has decided to put in a Wireless network and want to keep it sepeate from rest of the network. I have been asked to scope out DSL/Cable internet connections.
I am not familiar with setting up 2504 with dsl router.
Any basic guides for setting up 2504 with a dsl? do i need any static ip addresses for this setup or dhcp lease provided to cable modem would do?
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Jul 26, 2011
Ambit U10C018 send light not working. All other lights indicate proper functions. Usb not in use or connected. Enet, power, ready, receiving and sync all appear to be working properly. Have rebooted both modem and computer countless times, replaced Ethernet card (DFE-530TX+(Rev f), checked cables, all appear normal. Suddenlink service, cable guy didn't locate problem (didn't try very hard either).
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Jan 15, 2012
I current have a Cisco 2100 Cable modem (192.168.100.1) connected to a Cisco Linksys E2000 (192.168.0.1) that is connected to a Cisco 3550 (192.168.0.10). I would like to relocate the E2000 to another room. This would require me to connect the 2100 and the E2000 through the 3550. I have had to set a MAC address clone on the E2000 of the PC that is also connected to the 3550.
The question I have is how do I get this all to interconnect so that the E2000 is used by the 2100 for validation to the internet provider (Time/Warner). I am also using the E2000 for DHCP.
Here is a copy of the running config:
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
[Code].....
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May 23, 2012
Have had ADSL installed through a router, connected the wireless router and it works fine Have since connected the original router via -120mtrs of CAT5 cable to extend to the house. Connection through LAN is fine into desktop however the minute we try to connect an additional wireless router the connection fails. We have even put the LAN from the second Wireless into the desktop and there is no connectivity.We have had a technician come to sort the problem, they advise that they have no explanation as to why the LAN works from the distance but the wireless does not. They have suggested that we need to cut the CAT5 half way and put an antenna up to connect the two routers.
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Feb 7, 2011
I am trying to connect a Netgear wirless router to my cable modem. I have followed the instructions on the set up wizard but it fails to get a connection with the IP and DNS info I provide.I got the IP address info by connecting intially direct from the modem to the PC and then went to Run CMD and type ipconfig /all. I then started the set up wizard and followed the instructions, turning things on in specific order etc. After input the IP and DNS info it reports an error and tells me to check the address information is correct.My internet is a static IP connection (so it tells me and the IP information doesn't change).
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Dec 8, 2012
I have linksys router connected to my cable modem. I want to change it Belkin AC900. How can I keep the linksys connected until I have tested set up for Belkin AC900 router.
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Mar 11, 2012
My home lab is in a different room than the cable modem. I have a wireless N router in the room with the cable modem. I have a wireless access point that is connected to a Cisco 2611XM routers fa0/0 interface. The 2611 accepts the DHCP address from the wireless router. However, I can't ping past the wireless LAN 192.168.10.0 network. I know with the wireless router it's two layers of DHCP. Should remove the DHCP settings from the wireless router? The wireless router is a TrendNet TEW-651BR. I can ping my iphone or any device conntected to the wireless router. And my laptop can ping default gateway of the wireless router, which I assume is the cable modem, however the 2611 cannot. So I'm assuming that's why the hosts behind the 2611 can't get to the internet. I followed the below instructions. I know the instructions don't assume your using a wirelss router between 2611 and the cable modem. But, I really don't want to run a cable to the cable modem.
[URL]
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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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Apr 22, 2012
I have a 192.168.1.xxx network connected to Verizon FIOS via Actiontec MOCA / router. I also have a 192.168.15.xxx network connected to Comcast via Motorola VT2442 router (used for Vonage) and a Motorola SB6121 cable modem.
Each network has it's own gigabit switch connected to each router. The two networks are physically separated but switches and routers are physically side by side.
What is the best configuration to allow devices on 192.168.1.xxx network to communicate with devices on the 192.168.15.xxx network (share printers, NAS, etc), but still have each network served by it's respective ISP, and each device still get it's dhcp, dns, gateway, etc from each respective router?
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Feb 20, 2013
I want to create a DMZ by having a less sophisticated router connected to cable modem, which would have the webserver which contains no sensitive information, and then the EA3500 to which my laptops and desktops which contain sensitive information would connect to. Can CCC work through that first router?
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Aug 9, 2011
I want to connect internet via telephone cable by using rj11 jack from my ethernet switch to another computer it is 150mts away from my office premises.
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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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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 255.255.255.0 subnet mask?
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Sep 17, 2012
When i connect two cisco 2960 series switchs via stright trough cable causes delay in transmission sw1 has vlans and having trunk port connected to router all vlans are able to access internet sw2 is connected to vlan5 on switch1 sw2 has factory default configuration computers on sw2 can access internet but I have low bandwith problem on sw2 there is transmission delay problem?
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Jan 30, 2012
All of a sudden, the router's internal ethernet switch has started to get very slow at connecting to local machines. I can observe the connection fading in and out on each connected machine for up to half an hour until it gets stable. None of the settings have been changed lately.When I use WI-FI, the problem doesn't occur.
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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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Jun 28, 2012
I have a problem, i would like todo MACSEC betwwen two switches cisco catalyst 3560-x but I know that for this operation i needed ACS server 5.1 is it possible to encryp dataflow without ACS server and if you have the configuration
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Apr 15, 2013
I have a 2 cisco switches that are at different sites one is a Cisco CAT4500 and other 3560. The connection between the switches is a layer 2 fibre link. CAT4500 and 3560 both have VLAN interface ip addresses in order for me to connect to the switches.
I have PC A connected to CAT4500 and PC B connecting to 3560. All these devices are the same VLAN and in the same subnet. I do have trunk links all the way though allowing this vlan as we run vlans. From PC A, I can ping CAT4500, 3560 and even PC B. This tells me everything is fine regarding Layer 2 & 3.
As soon as I move PC B and connect it to the other switch CAT4500 or move the other PC vice versa (this happens in both directions). Both switches learn that the mac address has moved locations and updates its mac address table accordingly. So when I do a show mac address table and show arp, everything has learned and moved fine. However when I try to ping any other device from PC B I cannot. So the 3560 switch PC B was originally connected to, I can no longer ping, the switch cannot see the pc also. It is as if PC B has not learned anything from the switch and cannot respond or reply to any icmp. I have tried this with different end devices, same thing. I am now thinking it has something to do with the switch.
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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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Mar 24, 2011
I inherited a BEFCMU10 v.3 cable modem from my boss who switched to FiOS and I would like to use this with my Comcast connection.All I received from him is the cable modem and power adapter, what do I need to install and get this cable modem working? My router is WRT-54G.
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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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Jun 4, 2010
some reference material about configuring my WAG320N to use my cable modem via Ethernet port 1. I've seen it mentioned that's its possible, however I've been unable to sort it out myself.
And before you ask, I've brought the DSL router as I'm moving in the next 12 months and my new base will not have access to cable internet and I'll be reverting back to DSL.
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Mar 25, 2012
If i have 3 x 3560s do i need 3 cables connect one to each other then the top one to the bottom one - like the 3750s stacking stacks -- or is it just one cable between each device no cable between top and bottom
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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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Jan 29, 2013
We have 2x WS-C3560X-48 with the 10Gb SFP C3KX-NM-10G module.I want to use the 10Gb SFP (with a redundant 1Gb link) between each of the switches.Below is the configuration what I think I should use. Is this correct?
SWITCH1
int TE1/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode active
[code]....
We also want to utilise Link Agrrigation for the servers that attach to the switch. Would this config be correct?
port-channel load-balance src-ip
int range x
switchport mode access
switchport access vlan 1 (They are all on the default vlan)
spanning-tree portfast
channel-group x mode active
(Then I would configure the LACP config on the server) Is there anything I am missing?
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Oct 15, 2012
Scenario: Two buildings connected with a private leased fiber line, so it does operate as a LAN. There are several subnets and everyone at both buildings needs to be able to access all subnets. However the physical machines on those subnets are building specific:
-Building 1: 10.2.0.0/24 (vlan20), 10.4.0.0/24 (vlan40), Internet connection
-Building 2: 10.1.0.0/24 (vlan10), 10.3.0.0/24 (vlan30)
The majority of the traffic between the subnets is specific to the buildings as well (i.e. most of the traffic is between 10.1 and 10.3 or 10.2 and 10.4).
Currently I have a Catalyst 3560 at Building 1 operating as the single "core" L3 router (and then a variety of switches connected to that). I have another 3560 at Building 2 that I'd like to turn in to the "master" L3 router for the two subnets primarily used by Building 2. In other words, make it so traffic from 10.1 to 10.3 doesn't have to run to building 1 just to get back to building 2.
I've got a basic knowledge of adding VLANs, VLAN interfaces and a static routes. The part that I'm getting confused on is that the Building 1 core router needs to make its default route to the firewall (and on to the internet) but "know" that traffic on vlans 10 and 30 gets sent across the fiber line to the other router. So I'm assuming this gets done with some combination of vlan definitions, vlan interfaces and static ip routes on each router.
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