Cisco WAN :: Connecting A 1721 Router To A Larcom Unit?
Apr 20, 2011
Monday, I had a cisco 1750 router in place suddenly stop communicating to a Larscom ISP owned unit. Since then I have sent two replacement 1721 routers with WIC-1ENET cards. I have used the original straight thru cable to connect the 10baset port on the Larscom to my E0 on the WIC-1ENET. No link lights on either. I have also tried a known working straight thru cable and a crossover cable. No link lights.
I can take a crossover cable from a pc and ping the E0 port without issue. The ISP is telling me it is an issue with my equipment.
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Aug 22, 2011
I managed to setup a 1721 router as a vpn server connecting to it using a cisco vpn client however altough I am obtaining an ip address as defined in the dhcp pool I am unable to communicate with both the remote network and also I have no internet as soon as I connect.
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Nov 17, 2011
I have a plug into the mains network, but I need to connect more than one RJ45 cable to it.What is the best way to do this?Also, could I somehow connect a wi-fi extension to the plug in unit?
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Nov 19, 2012
configuring VPN in my cisco 1721 router to connect in vpn client
I have the public IPs.
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Apr 24, 2012
I am going to configure ospf on cisco 1721 router but when I give command
conf t
router ospf 116
it does not show (config-router)
I am attaching sh run and sh version herewith attachment
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May 8, 2012
I have a 1721 router with 3 equal routes to 0.0.0.0, using CEF for load balancing with universal load balancing algorithm. It doesn`t NAT, just routing. I wonder which is the maximum capacity of the router, since it should support up to 40000 connections to different destination IP. Is the limit set by the router resources (CPU, memory, ...) or a maximum limit of entries in the table FIB / RIB?
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Mar 3, 2011
Trying to work out if I can setup a VLAN interface on a 1721 router.The only interfaces that are listed are the Ethernet (W1-ENET) and the Fast Ethernet interface.I'm still super new to all of this and learn how to change IOS via rommon and TFTP after realizing I had an IOS too large for the memory?
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Jan 10, 2012
I am in the process of configuring two vpn tunnels on one interface of cisco router series 1721. Any link or document with more information?
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Jul 13, 2011
I have the Cisco series “Cisco 1700” routers operational at my client site, These router suddenly get reboot with 1 or 2 hrs gap. See the below errors which has been captured in router logs:
============================================================
00:00:09: %SYS-5-CONFIG_I: Configured from memory by console
00:00:11: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C1700 Software (C1700-Y-M), Version 12.2(16.1)T, MAINTENANCE INTERIM S
OFTWARE
TAC Support: [URL]
[code]....
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Mar 27, 2011
Is it possible to set up a vpn tunnel on a 1721 router that uses the following ios:
c1700-y7-mz.124-13b.bin
I thought I had read somewhere that tunnels were not supported on the 1700s but wanted to make sure. If they are I would like to know if they are supported in the above ios.
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Feb 25, 2011
I have cisco 1721 router so I installed an ethernet interface card so when I make show run I found that there is a fast ethernet 0 and ethernet 0 (which I installed) so i wand to make subinfaces of the etheernet 0 but I can't. I tried to make encapsulation dot.1q but it doesn't accept it.
Is Ethernet0 supported to generate subinterfaces?
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Jun 15, 2011
The place where I work has some "old" Cisco equipment that they no longer want/need due to upgrading just about everything.Among the stuff are a couple of Cisco 1841 units.ould one of these be a lot better choice then setting up OpenVPN for an office that has about 11 computers provided that they would actually be willing to pay for the 1841?What about ease of setup?Is is possible to use the 1841 for only VPN and have a Zyxell gigabit unit(they already have) as the router?
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Oct 20, 2011
Long time since I have had to configure a router and have a small project
Here is what I have in a simple diagram:
PC(static IP)--to--Switch--to--(Ethernet0 int, WIC0)1721 router(FastEthernet0 int, built-in)--to--Switch--to--PC(DHCP)
I need static IP PC to be able to ping the DHCP client. Static IP units 10.1.1.x/16, DHCP clients 10.1.3.x/16.
I have found these overlap and thus give errors and will even shutdown the interface if I enable certain things like routing or bridging.
So I gather I need to change one interface IP range, which would be the DHCP side, I need to stay 10.1.1.x/16 for static side.
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Jan 26, 2012
enable dot1q encapsulation on two ethernet ports on a 1721 router. I am able to configure it on the built in fastethernet port, but not on any interface provided by a WIC-1ENET or a WIC-4ESW. I have an application that requires two physical ethernet ports that support dot1q encapsulation.
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Jan 10, 2012
I use a wired network connection to my neighbours Vodafone Modem (We share his monthly cost). I also have a TP-LINK 54M Wireless ADSL2+ Router from a previous broadband contract with a landline phone company. Is it possible to reset and configure the TP-LINK Router to act as a relay unit, connected to the network cable, so I can then use my laptop elsewhere in the house?
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Jul 28, 2011
My BEFSR41 died. What is the replacement for this unit? I do not need wireless.
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Apr 7, 2011
i got a big problem, during a configuration reset i got an electrical blackout. I have set the configuration back after a password reset and send the reset prompt. At the restart of the router the blackout take all for 10 seconds out. When i restart the system an connect the router with the hyper terminal i get the following output:
[Code].....
I think the config was lost but how can i restart the router and enter a new one?
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Feb 22, 2012
I am working on a backup system for my WAN. Verizon quoted the HWIC-3G-CDMA-V to work with my Cisco 1721 router. I have a bunch on these routers on a shelf and thought I would use them for the 3G network. Looking at the Cisco web site it does not list the 1721 as being able to work with this HWIC. I thought it might not be listed as the 1700 series are End of life. Whether it will work?
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Jan 15, 2012
I would like to know can we configure vlans with cisco 1721 Modular Router? Is it Possible to configure lan environment with the vlans configured in 1721 router without a managed switch?
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Jul 11, 2012
My internet is T1 by Verizon. My mom's company Siemens pays for our internet because she works from home as medical tech support on the phone. Okay so the T1 had to be laid out to our house underground I think because where we live, other brands of internet aren't available. The T1 goes from the box outside into our basement and hooks up to a Cisco 1721 modem. From the 1721 the internet goes out to a wireless router that is sitting right next to it. This wireless router is a Linksys WRT160N V2. We have several cables coming out of the WRT160N V2 to go to the first floor for hardwired connections, but one cable goes to the attic and connects to a second wireless router. The second wireless router is a Linksys E2000. We have several cables coming out of the E2000 that go to the 2nd floor to serve as hardwired connections.Okay so let me explain where things went wrong.
After a storm our power went out. Eventually the power came back on, but every now and then our internet would shut off for like half a day then turn right back on, so our internet was getting really really spotty. The [b]AL[/b] light on the Cisco 1721 would come on every time the internet went out. It was so bad that my mom had to get an aircard from verizon to get internet. So after two weeks of spotty service and arguing with verizon trying to get them to come fix the problem, they said try resetting your wireless routers because they might have "bad data" in the lines causing spotty connection. So we reset the wireless routers by holding down the reset buttons on the back. Well.. this reset all of the settings for the routers which Cisco facilitated set up, and now our wireless routers are out of warranty date so they can't set the wireless routers back up. However, we have copies of the online wireless router set up page, so we thought maybe we could just set them up ourselves.Well the problem is... We don't know how to connect to the wireless setup pages.. I read something on the internet about setting up wireless networks and to type 192.168.1.1 into our browser(Mozilla Firefox) and that would bring us to the wireless setup page. But the page does NOT ever come up.
Another way to find the IP address of our wireless routers would be to try going to the cmd and typing in ipconfig and using the Default Gateway IP address for the browser to connect to the setup page but that doesn't work out either.... Right now I unhooked the Linksys WRT160N V2 and hardlined the Cisco 1721 to the Linksys E2000 to a PC on the second floor because I figured it wouldn't work out if we had two wireless routers running at the same time. Currently the browser is taking me no where at all. It just says "Connecting..." but nothing is loading up at all.I tried hardlining from the Cisco 1721 to my mom's laptop, which is her work computer, and I got no response at all. I figured it might just be her work computer that was messing up and not allowing her to hardline into the 1721 so I tried hardlining the Cisco 1721 straight to the PC desktop on the second floor(we have no other laptops other than my mom's work laptop) and nothing went through. Then my dad says the Cisco 1721 has been configured so it doesn't direct connect, meaning that it has to go through a wireless router.
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Jan 26, 2012
For a while now I've been thinking of setting up a (hopefully) secure remote access from a location outside of my local network. Since I'm going to be away from where I usually live for about six months due to the location of my Course that I'm going to study, I want to be able to remotely access the router if something were to happen. Up until this point, I've been doing the management through a Teamviewer 6/7 remote access with my home computer and connecting from the inside IP address (Example: 192.168.1.1), but it's going to be taken away so I wouldn't be able to do that this year. Is it possible to set up a secure telnet on a Linksys E3000 Wireless Unit that way I can control it through Command Prompt, or would I have to set up Remote Management Access to use the unit outside the network through programs like Internet Explorer or Mozilla Firefox?
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Feb 20, 2013
I am using a bunch of Cisco 1721 routers for my T1 lines. We recently purchased Digi cell modems as a backup for the T1. On configuring vrrp to work on both devices I discovered that IOS 12.3(6c) does not support the "vrrp track" feature. After reviewing the Cisco Feature Navigator I could not see an IOS that will support the vrrp object tracking. Is that correct? The routers have T1 WIC's installed. If it does work what is the latest IOS that will work on this end of life product?
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Sep 26, 2011
I'm looking to replace a broken Linksys 8-port router that was connected to a D-Link Wi-Fi unit. I'm not sure what hardware to go with for use in a house ~2000 sq. ft. I'll be using an Xbox (currently hardwired), Wii (wifi equipped), iPad, PC laptop along with a desk top PC (currently hardwired) sometimes simultaneously.
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Jan 21, 2008
I purchased a WRT150N in early Dec 07. I had a number of problems with the unit disconnecting from wired and wireless connections erratically anywhere from 1/2 hr to 10 hrs. of operation. Troubleshoot thru Linksys chat. Ended up replacing router. Now I am having the same problem with replacement router. I've updated my windows XP, SP2, updated Ethernet driver and manually reconfigured router per Linksys advise. Wife and my laptops have N adapters, primary PC is wired in. It seems to disconnect all connections at same time, totally random. The only way to reconnect is to power down router for a few seconds and then power up.
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Aug 23, 2012
I have a 1721 router in my home & I want to setup it for firewall/ vpn. Is it recommended to purchase a WIC-1ADSL? What module is recommended for VPN? Is it possible to setup VPN using DSL / Dynamic Ip connection ?I want to explore on Cisco security & I get this advice from a supplier.
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May 13, 2012
I can access the LAN environment 10.1.1.X from 20.1.1.X but cannot get out the gateway to the internet? The linksys gatway model is a WRV54G.
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Sep 18, 2011
I've got three Cisco 1721's and a 2610, two of the 1721's are 32f's, the other one is a bit older but is still the same model. The two Cisco 1721 32f's have 1-dsu-t1-v2 wics in them, and the older 1721 has a 1-dsu-t1 wic in it. Now no matter how i have configured it the old t1 wic will not talk to the v2 wic. I've tried putting the old wic into a 1721 32f and it doesn't work at all!
What i have working:
router DCE (1721 32f with v2 wic) can talk to router DTE (1721 32f with v2 wic) no problem with this configuration.
Router DCE:
-service-module t1 clock source internal
-service-module t1 data-coding normal
[ code].....
Router DTE:
-service-module t1 clock source line
-service-module t1 data-coding normal
[ code]....
Router OLD (1721 with v2 wic) can talk to router DTE (1721 32f with v2 wic) no problem with same config. What doesn't work: Any router with 1-dsu-t1 (old) wic to router DTE (1721 32f with v2 wic). again same configuration as before, so whats going on that i cant get this to work? Is the old t1 wic not compatible with the new t1 wic?
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Oct 9, 2012
I am having a problem configuring a VPN connection from a 1721 router to an ASA5520. The router has already been configured, but I have been asked to setup the VPN.I think the issue is because they are using a Loop back interface (which I have never configured for before).
The "sh crypto isakmp sa" command shows:
dst src state conn-id status
5.6.7.8 1.2.3.4 QM_IDLE 4 ACTIVE
where 5.6.7.8 is the ip on Loopback0, 1.2.3.4 is remote peer ip. Pings to the remote network don't work.
Here is the (slightly edited) config of the 1721 :
Current configuration : 3838 bytes!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
[code]......
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Mar 15, 2012
Can Cisco 1721 act as DNS proxy? If yes, how can I configure it?
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Apr 17, 2007
I can not apply the LLQ to ADSL ATM interface. the system take the command with out any error message, but no in the show running config. Any Cisco link can explain this? [code]
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Feb 10, 2012
I just purchased one of each of the above, both with 1ea WIC 1DSU-T1, and would like to connect them directly to each other in a lab scenario. Do I need to have an RJ48 cable or will an RJ45 work? I have them connected now, but they are not seeing each other. They are connected via S0 on the 1721 and S1/0 on the 1760.
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Mar 18, 2012
i have some issue with Hwic-4ESW, if i install one card(Hwich-4ESW) is working all port then i install one more card ( Hwic-4ESW) it not working.interface and vlan is up but from my PC to port Hwic-4esw not working. what is problem on this ?
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May 29, 2013
I was looking for Rack Unit required for 7206 VXR & 3945E but couldn't find it.
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