Cisco WAN :: 1841 ADSL Interface Dropping Connection
Jul 2, 2012
We have an ADSL2+ line from a WIC in a 1841, everything has been fine for the last few years and then the last few months the connection going down. When checking the interfaces the ATM0/0/0 is up up and the same for the dialer interface we are using, they are both up/up, but this still needs a reload of the router to be functional again, shutting the interfaces does not bring the connection back up.
I am not an expert on ADSL lines, I have never really had a problem with anything previously. The router was running Netflow to a network monitor wondering if this or logging was causing an issue with entries in the buffer??
Here is an output of show dsl int, would change the firmware, it has been fine all this time before though we are running IOS 12.4(24)T1 advseck9-m, as far as I can seen from our ISP the config for ADSL is all correct. [Code]
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Mar 2, 2012
I have been having a weird connection issue for a week or so.The problem is at the first time i boot up my modem it simply cant connect.DSL Line LED keeps blinking- handshaking and training as it says in modem config page.After maybe 5 minutes or 2 hours, totally random.It picks up the connection, i can use it for hours until it randomly drops down once again.Ive contacted my ISP and they came over two times, they state the line quality is not suitable for my connection speed and it will be solved if i drop down my connection speed.Doing that is a painful process cause there is no other speed/quota package suitable for me, so i wanted to ask you people about it before i take action.
My modem is a Dynalink RTA1320 and i tried with another modem, tried mine in a friends house.Plus i went to the place where the cable enters my house and tried over there too, it didnt work as it should pick up in about 20 seconds.Here are stats my modem shows in the config page.[CODE]
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Jul 6, 2012
Recently, i bought a LinkSys WAG120N ANNEX-A to replace my old speedstrem4200. Well everything was fine, but after 2 days of it installed, it started to drop my ADSL connection.
Sometimes, it remain connected for 4-5 hours, then drop, or sometimes, it drop every 30min-1hour.I tried upgrading the firmware to 1.00.16, but no luck, it still drop the connection.I have 3 computer plugged to the router via cable(wired) plus 1 netbook(wireless) and 1 ipod (wireless).Sometimes, when 1 computer is turned off, it seem to make the ADSL connection drop when the LAN light turn off. I noticed everytime it drop the ADSL connection, in the logs, i get this:
Mon, 2010-11-08 22:24:57 - Terminating on signal 15. Mon, 2010-11-08 22:24:57 - Enter: tdb_store. Mon, 2010-11-08 22:24:57 - tdb_store: calling tdb_update. Mon, 2010-11-08 22:24:57 - Enter: tdb_update. Mon, 2010-11-08 22:24:57 - Enter: tdb_store. Mon, 2010-11-08 22:24:57 - tdb_store: calling tdb_update. Mon, 2010-11-08 22:24:57 - Enter: tdb_update. Mon, 2010-11-08 22:24:57 - Enter: tdb_store. Mon, 2010-11-08 22:24:57 - tdb_store: calling tdb_update. Mon, 2010-11-08 22:24:57 - Enter: tdb_update. Mon, 2010-11-08 22:24:57 - Couldn't increase MTU to 1500. Mon, 2010-11-08 22:24:57 - Couldn't increase MRU to 1500 Mon, 2010-11-08 22:24:57 - LCP down. Mon, 2010-11-08 22:24:58 - Modem hangup Mon, 2010-11-08 22:24:58 - Connection terminated. Mon, 2010-11-08 22:24:58 - Connect time 215.0 minutes. Mon, 2010-11-08 22:24:58 - Sent 50496235 bytes, received 212267122 bytes. Mon, 2010-11-08 22:24:58 - Enter: tdb_store. Mon, 2010-11-08 22:24:58 - tdb_store: calling tdb_update. Mon, 2010-11-08 22:24:58 - Enter: tdb_update. Mon, 2010-11-08 22:24:58 - Doing disconnect Mon, 2010-11-08 22:24:58 - Exit.
I tried changing the MTU settings in the router to 1492 (my ISP default) but didnt work.
Tried changing the MTU to 1492 on every computer and still got the same problem.For now im using the WAG120N in bridge mode, and still using my old speedstream4200 as ADSL modem.
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Feb 7, 2013
I have a Netgear DG834G v3 ADSL router which I have had since early-2007.
When I work from home I connect to office networks on a Win7 machine via a Rackspace-provided VPN using Cisco System VPN Client 5. It works well, except for one issue that is costing me time every working day.
I get intermittently disconnected from the VPN, without any warning or apparent reason.
Since I bought the router 5-6 years ago I have had no need to update firmware, so other than ISP configuration I have had no need to change the router at all and I can say it's worked well for me.
What would be the reason for my VPN connection dropping? Is this an ISP issue (my ISP is Carphone Warehouse/TalkTalk) that I have to take up with them or is it more likely a hardware problem with my router or a VPN configuration issue?
My instincts are to not look into VPN config at the moment as I know a colleague who uses the same VPN through a different router and ISP can stay connected for hours, even overnight.
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Apr 9, 2011
Is it possible to set up a WAN interface on a FastEthernet interface of a Cisco 877 Adsl Router ?Due to my ISP, i've to use an external VDSL modem and must connect it to my cisco 877 router (and leave it's adsl interface unused).But i don't know how to set up a wan port, other than the adsl interface itself (dialer0), on my cisco.
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May 9, 2012
i have a 1841 cisco router and i recently purchased a 1 port HWIC wan interface card. My problem is that I cannot see the interface in my config file. Is there something i am missing?
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Dec 12, 2011
I am configuring a 1841 router for use in small out office. I will use the s0/0/0 for main WAN T1 connection. I then wanted to use the ATM0/1/0 WIC-1-ADSL card as a failover. I am using weighted static routes for failover. Fe0/0 is LAN interface. When I go into SDM and look at the ATM interface it says this configuration is unsupported?
1. Can't I just get a DSL modem and connect it to fe0/1 and not use ATM WIC and use below for failover?
2. If I have to use ATM WIC what needs to be configured for it to work with Att aDSL?
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May 10, 2011
I have a CISCO 1841 with a HWIC interface to my ISP. I want to make a ADSL connection and my current running-file is: [code] The problem I have is that the ISP connection is established but then goes down.
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Nov 27, 2011
I have a Cisco 1841 router with an HWIC-ADSL module installed. My ADSL connection is PPPoA with a dialer interface and I have been provided 6 ip's from my provider to use on this service. Previously I have connected Fa0/0 on the 1841 straight onto my network and used NAT and ACL's on the 1841, I would now like to change this and have Fa0/0 connected to a Palo Alto firewall and use the Palo Alto to provide NAT, Firewall & site to site VPN functions. What config would I require on the 1841 to allow me to use one of my ISP IP addresses on the Palo Alto to allow it to be a VPN endpoint? Do I need to configure the 1841 in bridge mode?
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Nov 28, 2011
I have a cisco 1841 router in place. I also have a ADSL module which fits into the cisco router. My understanding is that if configured correctly, If the primary circuit were to fail (Ethernet Circuit MPLS), the ADSL would take over services until such time the ethernet link becomes available.
Therefore the ADSL circuit is used as a resilient link. If this is possible, can the Cisco 1841 be setup to automatically switch over to the ADSL? Would there be some sort of heart beat between the ethernet circuit and adsl circuit?Also from the other end of the Cisco router, the connection goes into a firewall. If the Cisco handles the failover, I assume I would not need to configure anything on the firewall.
The end users beyond the firewall, should be able to continue, however the performace would be degraded?
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Aug 5, 2012
I am trying to configure a Cisco 1841 to allow the users to access the internet. This is my first step with ppp. All the rest of the configuration is ok but I don't know how to setup the interfaces Dialer0 and ATM0/0/0.
Need very basic configuration that I can analyze and use on my device?
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Feb 22, 2012
We installed one of these devices as our gateway a couple of weeks ago, flashed the firmware to 1.2.4(003) and it worked perfectly until this morning where it keeps resetting the ADSL every minute and losing the web interface to the unit.
The log endlessly reports this:
Feb 24 11:26:00 SRP547W cron.info cron[8779]: (root) CMD (/sbin/check_gn)
Feb 24 11:26:00 SRP547W cron.info cron[8781]: (root) CMD (/sbin/check_ps)
[Code].....
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Nov 9, 2012
I've moved a Cisco 887 router from a site where it was used to dial up on an ADSL line to a new site where we have a EFM circuit which terminates at a Cisco 1841 router managed by our ISP. I therefore need to re-configure our 887 router to work as a conduit from our servers back to the Cisco 1841 as its gateway.
I have asked from our ISP and they told me that i need to configure the 887 to use IP address 176.35.140.65 255.255.255.248 and its gateway should be 176.35.140.70. That's great advice in theory but I don't know how to configure this correctly
Our internal network is using subnet 192.168.42.XX which will need to be retained for local devices.
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Dec 17, 2011
We have a cisco 1941 with line t1 Symmetric, (Also have Cisco 1841 unused, but works) I would like to connect the Cisco 1841 to four Adsl Backup lines in case the T1 or the Main cisco 1941 go down I know a BGP is needed on our ISP site,
How can i connect four Adsl lines to The cisco 1841 (Backup) and make them work in a Load Balancing way.
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Jan 11, 2010
I have bought a WAG320 & ever since I've had it the ADSL line keeps dropping every few hours. The LAN network is fine & I have 7 computers connected to the router wirelessly. When I press the re-set button on the back of the router everything is fine for a few hours then it starts doing it again?
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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 27, 2012
I am trying to figure out how to use a Cisco 1841 IOS router to take traffic from one interface and source NAT it out towards the Internet on one interface and at the same time NOT perform NAT when sending the traffic towards a different routed interface.
Here the RemoteSite has connectivity back to the MainCampus, but there is no need to NAT traffic from the one site to the other. They share the same umbrella of address space. However, the RemoteSite needs to have its Internet-bound traffic NAT'ed out to the Public Internet via a third interface. I know that I could just NAT everything out from the Remote Site and map the traffic back onto the same address space for intra-campus communication, but I'd rather avoid that and just NAT where I need to NAT it to the Internet.
I do have a caveat here: in the event that either the MainCampus or the Public Internet interfaces go down, I would like to failover traffic from the downed link to other good link. For example, I want to NAT all traffic (including "intra-campus" traffic) out via the Public Internet if the direct link to the MainCampus is down. For the other example, if the Public Internet direct link is down, I would just send out all traffic without NAT towards the MainCampus.
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Mar 2, 2013
I have installed a couple of SRP547W's and can't ping the external side of the ADSL interface.
Is there an option to turn on "respond to ping" and also are you able to forward to a internal IP?
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Nov 8, 2012
Using Cisco 1811W with IOS 15.1(4)M5. FE0 and FE1 are connected to the internet via Billion ADSL2+ modems operating in bridged mode. Both lines are similar so I'll only discuss FE0 from this point on.Local subnet is 192.168.128.0/24 with router on 192.168.128.1 as default gateway. Modem on FE0 has static LAN IP of 192.168.128.2 and when plugged into the switch on the LAN side, the web interface can be accessed at that IP address. Unplug the modem from the switch and plug it into FE0 and it now works as desired providing access from the router to the internet but the web interface is no longer accessable at 192.168.128.2
I tried adding a static route "ip route 192.168.128.2 255.255.255.255 FastEthernet 0" and also "ip route 192.168.128.2 255.255.255.255 Dialer 1" Neither worked and presumably it isn't that straight forward. Possibly NAT or other routing configuration required.Although there isn't much to configure when in bridged mode, I mostly want this setup so I can look at the ADSL connection status and for the modem to write messages to syslog (works when plugged into switch on LAN side), or SNMP access.
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Jan 19, 2012
Is the ADSL line interface on Cisco 877W not initialising a known issue? This interface on my router has been in this state for more than one month, with the rest of the router seemingly operational. The interface was connected directly to my ADSL broadband and worked well for two years. But then, about a month ago, the interface went down. I saw the exact moment this happened recorded as a syslog message. The only information was that the interface status had changed to down.
Initially I thought this was a matter of reload the router and all will be well. Did not happen. Then I thought my broadband connection was to blame. However, this option was quickly ruled out. So I went on to exhaust all troubleshooting options, including reflashing the router with the saved image and totally changing the configuration. Still no change. I have had to go back to my old BT home hub for internet access. In terms of speed this actually works a lot better than the Cisco router. But I would still rather have the router connected to my broadband line. What can I do to bring the ADSL interface back to life?
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Apr 27, 2011
i will going to buy a router 2911 but i want know if support a interface ADSL modulo like backup in case that my primary link WAN Ethernet down and up the adsl link with a module HWIC ADSL pots.
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Dec 7, 2010
I am trying to roll out a new internet router. The problem I am faced with is the LEC only supports VLAN 1227 and greater, specifically they are assigning me VLAN 2528. I am able to create the sub-interface and setup dot1q encapsulation for VLAN 2528, but the vlan database does not have the ability to add VLAN 2528 to it so I am unable to get layer 2 up and going, thus preventing me from getting the implementation done.
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Nov 4, 2011
I use an 1841 router as an internet facing firewall with a 10MB MetroE connection. Lately users started reporting slow internet download speeds and web pages timing out. Bandwidth reports do not show the link as being saturated so I looked at the interfaces on the 1841. The interface connected to the provider shows OK as far as errors but the LAN side of the router shows steadily increasing input errors. It doesn't show any other errors, no CRC, frame, runts, giants or overruns, just generic input errors. What type of errors are those? Nothing is being logged on the console.
I moved the connection to another switch ports and the errors continue. I switched it down to 10MB and also changed the switch and the errors slow down but don't stop. Interestingly, the switch side never shows any errors. What can I do here? I guess it can be a bad interface but that is such a rare thing that I am hesitant to replace the router.
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Jul 15, 2012
I'm trying to troubleshoot one of our site today and can't seem to issue the show dsl interface command on a 1841 router. Does the same command is used for SHDSL or am I running with an IOS bug?
#sh dsl?
% Unrecognized command
#sh ver
Cisco IOS Software, 1841 Software (C1841-BROADBAND-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)
Technical Support: {URL}
Compiled Wed 13-Aug-08 15:42 by prod_rel_team
#sh inv
NAME: "chassis", DESCR: "1841 chassis"
PID: CISCO1841 , VID: V05 , SN: FHK13212639
NAME: "WIC/HWIC 0", DESCR: "WAN Interface Card - ATM (With multi line G.SHDSL module)"
PID: WIC-1SHDSL-V3 , VID: V02 , SN: FOC132041KD
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Jan 13, 2013
I have a cisco 1841, Im trying to write an app which will get the Interface Utilization on my 2 atm interfaces and fast eth 0/0 interface.
I’ve been reading up and have got as far as downloading the codeplex snmp library project. I’m using the snmpget app to get details off my 1841 successfully, but I now need to know the OID for interface utilization and how to define which interface to get.
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Dec 22, 2010
I have a problem in my Cisco 1841 in Virtual-Access Interface all interfaces is UP Except Virtual Access is Down . [code]
when i want recover the virtual access to up ,should i do shut & no shut to the ATM interface.What is the cause of the problem, and how I can solve this issue?
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Jan 29, 2013
We are using SRP527 routers with PPPoE ADSL connections. From the SRP527 we create an IPSec tunnel to our core routers (Cisco ASR). We are wanting to change the IPSec tunnels to L2TP, and I need to know if this can be done from the SRP527. I cannot find any L2TP configuration options in the setup options.Can the SRP527W act as an L2TP tunnel initiator over the ADSL PPPoE interface?
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Feb 11, 2013
I have an 1841 between my firewall and the ISP. Three interfaces - multilink to ISP, FA to my firewall, and FA to my inside network. I use the inside interface for configs aand snmp access, etc. Only my ISP-assigned fixed address block will get routed to the multilink by the ISP but I am nervous about the inside interface sitting on my LAN. I know I can remove it, but if I keep it there, how can I set up an ACL so that all traffic from the multilink interface is denied to the inside interface? I suppose another way to think about it that the inbound iface can only accept traffic from its own outside, not from the router.I think this is fairly simple but I don't want to knock down the traffic if I get it wrong.
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Jan 3, 2013
we've to configure our router 1841 to use both 2 interface Fe for two different vlan (also the second has to go on internet).
Actually we have int Fe0/0 configured with an ip address 192.168.1.1 for lan1 192.168.1.0/24 and we will use the second int Fe0/1 with another ip address like 192.168.2.1 for lan2 192.168.2.0/24.
see below configuration:
[code]...
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May 16, 2013
I'm having an issue that I can't quite understand. I set up a test lab to get familiar with EIGRP routing. I have a Cisco 3845-MB with 2 VWIC2-2MFT-T1/E1 cards.sh ip int brief shows UP UP status on all serial ports. I gave it an IP address but I'm having trouble pinging the serial interface IP. It's dropping pings to its own S 1/1/0 interface when pinging from console. I have known good T1 crossover cables 1&2 - 4&5.
Here is the "ip int brief" from 3845-MB
3845-MB#sh ip int brief
Interface IP-Address OK? Method Status Prot
ocol
GigabitEthernet0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/1 172.30.2.1 YES NVRAM up up
Serial1/1/0:0 10.3.29.2 YES manual up up
Right now it's pinging itself at about 60 -90% success rate... and I can't figure out why it's dropping any packets at all. I have other issues with in the lab as well... but i think this might be my "core" issue.To make matters even more "weird" I've tried two different VWIC2-2MFT-T1/E1 cards and I drop pings with both of them.
Here is a sh run and a sh diag:
3845-MB#sh run
Building configuration...
Current configuration : 1434 bytes
!
version 12.4
service timestamps debug datetime msec
[code].....
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Dec 19, 2010
We want to terminate new 10M link via Ethernet interface on Cisco 1841 router. We have free Gig port on the router. We also have HWIC-FE module inserted in the router. However, our implementation team said that Cisco 1841 doesn't support 10M link. It is not designed to cater to such high Bandwidth.
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Dec 21, 2010
What are the possible effects of assigning an invalid address like 172.22.0.0 255.255.255.252 to a router interface. The 1841 router accepted the address?
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Apr 29, 2012
I am trying to use the connected WIC2-2MFT, as the servial interface on my cisco 1841.But it does not show me the option, under configuration interface
[code] What should I do to make this enable on this list?I am attaching the show tech-support, and show version of this device.
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