Cisco WAN :: 877 / 2800 - Use Static ADSL As Backup Connection
May 3, 2011
We have a few WAN connecting sites to ISP using BGP. we are looking at getting backup link for 1 site.
We have decide to use an IP WAN ADS L link. we will have 877 and 2800 for each link. from understanding, we have a static routing on IPWAN service. means when both BGP WAN and IP WAN connected to the ISP. ISP will use ADSL as primary ignore the BGP link. so other sites will see a BGP route coming from ISP via the ADSL link for this location.
So we have find a manuel solution, leave ADSL unplugged of power but setup same LAN ip address and connect the cable towards the core switch. when WAN link fail, switch on ADSL. So the static route will advertise to the rest of sites.
just want to know is there any auto solution can disable the ADSL link/ ppp link when the 2800/WAN route is up. and enable the ADSL port when the WAN is down. not sure if HSRP/backup interface/tracking will work? and how?
site office switch - > 2800 - > ISP - > ADSL -> ISP
(need this link to be backup and protocol down, so the ISP will not able to connect to this link and advertise as next hop)
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Aug 1, 2011
Site A, site B, site C, site D is connected using leased line each other. We are using Cisco 1800, 2800 and 2900. Each site also have Internet connection using ADSL connected to firewall, we are using pix 501 and ASA 5510.My question is, can i use the existing ADSL line to be use as a backup line if the leased line is down on any of the site??And i want it to trigger itself, once the leased line is down, the firewall UP the backup line? something like that..
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Jan 29, 2012
I was configuring route tracking at a client with several sites to route across GRE tunnels and being able to detect a failure of the main site. To my surprise when configuring a 2800 series router (after sucessfully configuring a 1800 series on the same infrastructure), a 2821 with IOS 12.4(24)T2 IPbase, the commands for ip sla object tracking don't show up.The feature navigator says the router supports this, but it just won't take the commands (also tried older versions of the commands such as "ip sla monitor.." and "rtr .." to no avail).
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Oct 16, 2011
I currently admin a WAN link between two international sites. I have a 2800 at each end. The primary connection between the two sites is 20MB Ethernet PIP MPLS BGP circuit. I also have a pair of T1's in a PPP multilink that I switch over to in the event the primary circuit goes down. I currently am doing the switch over manually. It takes me about 15 minutes to complete it, but I know there must be a way to make this an automatic process.
So a couple questions:
1) Is there a way to create an "enhanced multilink" with the 2 T1's and the Ethernet circuit in the same bundle, in effect giving me 23MBps bandwidth while still being able to maintain connectivity if one of the 3 links goes down? This is my preferred solution
and if 1 is not possible then
2) Is there a way to configure the router so if the Ethernet circuit goes down, all traffic will be automatically directed over the T1's, and then come back to the Ethernet when it's back online?
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Sep 13, 2011
I need to implement the backup between two sites I have router 2800 which is having a point to point connectivity with the far end.At the far end there is no router ,only one firewall is there on that firewall one access-list is there to allow the traffic .To implement the back up link i have created a site to site vpn .But the problem is as soon as the tunnel is establised .For the time being i have removed by site to site config from both firewall.
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Jan 31, 2012
In a site we currently have 1 BT provided ADSL link which is currently terminated using their device which I believe is some kind of 2wire device, which is extremely slow due to distance from the Exchange (4Mbps)...We have a growing number of users here and want to install a second ADSL line from BT to give them increased performance.
We have a Cisco 2800 sat not doing much so I was wondering if I could use this to load balance the link? I know BT do not support MPPP so therefore the maximum any user can get will be the speed of a single link (4Mbps)...But basically how can this be done..
Can I leave the two BT routers in place and place the Cisco 2800 behind them, or do I need to purchase two ADSL modules for the 2800 and terminate the connection there?Also once done, what do I need to do regarding actually setting up the load balancing? I have seen this:
[URL]
But am unsure as to how relevant it is? I am not sure I understand what the ACL's are being used for? I just want all users on the LAN to load balance out...
Also I am unsure of this statement:You potentially need to add policy-based routing for specific traffic to ensure that it always uses one ISP connection. Examples of traffic that require this behavior include IPSec VPN clients, VoIP handsets, and any other traffic that use only one of the ISP-connection options to prefer the same IP address, higher speed, or lower latency on the connection.I do not understand why a established session such as a VPN client, would ever traverse the second ISP connection anyway?
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Oct 7, 2012
I have Cisco 2800 series router. When I am trying to write memory getting error message " Error opening flash:config-backup-1 (No more root directory entries available)" When there is simultaneous access to a router's NVRAM, we might encounter these errors. In order to clear the line the other user(s) is (are) connected on and free the NVRAM, issue the clear line command. But still getting the same error message.
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Jun 27, 2012
Site A, site B, site C, site D is connected using leased line each other. We are using Cisco 1800, 2800 and 2900. Each site also have Internet connection using ADSL connected to firewall, we are using pix 501 and ASA 5510.My question is, can i use the existing ADSL line to be use as a backup line if the leased line is down on any of the site??
And i want it to trigger itself, once the leased line is down, the firewall UP the backup line? something like that..
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Jul 19, 2011
I am trying to change a static nat entry from this:
ip nat inside source list 1 interface Dialer0 overloadip nat inside source static tcp 192.168.0.246 25 interface Dialer0 25ip nat inside source static tcp 192.168.0.246 80 interface Dialer0 80ip nat inside source static tcp 192.168.0.246 443 interface Dialer0 443
to
ip nat inside source list 1 interface Dialer0 overloadip nat inside source static tcp 192.168.0.247 25 interface Dialer0 25ip nat inside source static tcp 192.168.0.247 80 interface Dialer0 80ip nat inside source static tcp 192.168.0.247 443 interface Dialer0 443
I have tried various methods from exec mode clear ip nat translation *
no ip nat inside source static tcp 192.168.0.246 443 interface dialer0 443 But I am getting cisco2800(config)#%Static entry in use, cannot remove.
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Feb 26, 2012
i'm looking for a cisco 881 configuration with SDSL line as nominal and ADSL as backup.
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Jan 4, 2011
I'm trying to get a solution together for a dial backup to an ADSL service, using an Analogue modem.The kit list is as follows:
Cisco 877
Multitech MT5656ZDX External Analogue Modem or USR 5630D External Analogue Modem
Rolled patch cable RJ45 to DB25M adapter (pinout from a cisco guide)
So far I am unable to get the router/modem to dial out at all. I know the modems work, I have tested them from Windows.
I have attached a couple of outputs from "show line" and "show line 1" from the router and also what I think are the relevent lines of config although it will be too much config and probably jumbled by now as I've tried quite a few things to try and get this working.
I am more concerned with the config relating to the connection of the analogue modem than the routing element.
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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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Aug 3, 2012
Is there a way to set static routes per VLAN?Example VLAN 100 sends all traffic to 192.168.1.1 and VLAN 200 sends all traffic to 10.1.1.1. (2800 Series RTR)I have 5 networks that have their own gateway to the Internet via satellite link. Those networks run over the same infrastructure on separate VLANs. They frequently send traffic to each other, which gets sent over a slow SAT link. I introduced a router to the network and would like to set all my hosts default gateway to the local routers sub-interface then have a static route that send all traffic that is not on one of my 5 networks back to that VLANs respective SAT modem to get routed out over the Internet.
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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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May 26, 2011
I'm able to configure the device with the IP, Subnet, GW and DNS given by my ISP. However I need to assign public IPs to my other two servers ( Apache Server, Firewall) which are connected directly to the device. I've tried disabling NAT and assign static ips to each server. However, when I go to change the lan ip on the router it won't allow it. the errors are: pv0 and iplan are on the same subnet cannot have ip_range
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Feb 8, 2012
I have configure 887 ADSL router with attached configuration. But users cant access internet properly. (Ex: yahoo and gmail mail cant access)
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Dec 12, 2012
Looking to have an ASA5510 with two internet feeds. Moreover, I would like to have my static nat translations continue to work on the backup feed. I have outbound nat working, however I cannot get the inbound nat to work. I had this all figured out in 7.x but now with 8.x I cannot seem to get it working. If anyone has a 8.x example config.
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Oct 16, 2011
I have a asa 5520 with an outside and backup interface. I am trying to configure two static nat statements from the inside to the outside and backup interface. Here is what I have configured so far.
object network obj-10.1.1.254
host 10.1.1.254
object network obj-10.1.1.254
nat (inside,outside) static 172.25.10.3
I want to also use nat (inside,backup) static 172.25.10.3
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Aug 25, 2011
We have a cisco 2800 router and are now required to allow users to be able to connect to another company's extranet. Having tried this it wont allow this connection so I have added this to the access-list 101
access-list 101 remark SDM_ACL Category=0
access-list 101 permit ip any host 192.168.0.246
access-list 101 permit ip any host 192.168.0.247
[Code].....
I dont think the gre is being allowed back in. I have attached a cut down copy of the config. I have just general experience of cisco routers and not cisco qualified.
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Dec 26, 2012
We have a six node MPLS network, all nodes route to our main office for a variety of services (email, core, fire shares, Internet, etc). Therefore, the link to our main office is crucial. In the event that the MPLS link to/from our main office becomes unavailable, we would like to establish a secondary route into our main office via virtual private network. Our main office and two branch offices have redundant broadband internet connectionsWe currently have Cisco 1921 routers as our branch routers and a Cisco 2800 as our “core” router at the main office. We also have two SonicWall TZ-200 series firewalls at the two branch locations and a SonicWall NSA-2400 at our main office. The VPN connection seems to work okay.How would I configure my branch routers to advertise and route traffic out the VPN connection in the event that the MPLS leg to/from our main office is down?
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Feb 11, 2012
We have a new remote site for customer which only have 3G connection and to add more pain to that they have dynamic IP address.the easist possible solution was EZY VPN.....client has 2800 router with 3G and at our end we have ASA.....the issue is that , that always server (clients nehind) asa initiate connection to the remote site ie to 3G.....the rule of thumb is that whenever client(ie EZY VPN) will initiate conection the tunnel will establish.
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Jul 3, 2011
I'm trying to backup my primary WAN with secondary backup connection - 3G WAN through Cellular 0/0/0.Point is that I need to track some external IP address on my primary interface, for examle 8.8.8.8. If it is not reacheable, then router brings up backup connection - 3G. This can be done by using dialer-watcher.Simple.But unfortunately my primary WAN interface is an FastEthernet, which is the coonected to a switch, switch to WAN . There is no dialer-watch commands on it. Thats sad .
One more time :
WAN -> SWITCH -> ROUTER(WITH 3G HWIC and Fa 0/0 connected to switch).
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Apr 6, 2011
I have many HWIC-3G-HSPA cards as backup connections and I need to keep them up for monitoring purposes. Being a backup connection they get little interesting traffic for them to spring into life but they are the source interface for a tunnel interface (we use DMVPN). The interface still insists on going down. I have even added static routes to the DMVPN hubs over the cellular interface and they still go down. What command do I enter to always keep them up? I had originally used 'dialer idle-timeout 0' and then removed it altogether which the same results. Below is what I have now.
interface Cellular0/1/0 ip address negotiated ip nat outside ip virtual-reassembly in encapsulation ppp dialer in-band dialer string gsmscript dialer-group 1 async mode interactive ppp chap hostname //username// ppp chap password //password//
ppp ipcp dns request
access-list 1 permit anydialer-list 1 protocol ip list 1
line 0/1/0 exec-timeout 0 0 script dialer gsmscript modem InOut no exec transport input all transport output all rxspeed 7200000 txspeed 5760000
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Dec 20, 2010
what is the simplest way to create backup WAN connection?I have setup 2 WAN connection(2 ISP, 1 is DIA w/ fix ip, 2 is 3G), but if I enable both interface ,then I unplug WAN 1. no traffic goes to WAN 2.I have already have 3G connection enable all the time (w/ command "dialer persistent") Cisco 2811+ Cisco-HWIC-3G,
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Apr 8, 2012
Just recently purchased an RVS4000 to take the place of an old NetGear FVS336, which supported multiple NAT translations. It appears that the RVS4000 does not support this, any other models in the small business line support this? I only need this for a backup Internet connection?
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Nov 9, 2011
I have reset the router of Cisco 870. I need to connect the router for ADSL connection but don't know how to do it.
[code]...
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Oct 23, 2012
I have an 1700 cisco Router and a ADSL connection to Internet.How may I use it on my home network?There's any configuration that I should to do?
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Feb 14, 2011
Im just wondering if it would be possible to emulate an adsl connection on a server. What i mean by this is if we were testing a vpn or something they would have to connect through this box on the network and act as if it were a ppoe connection. Has any ever done anything of a similar nature? Is it possible at all?
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Aug 24, 2012
i have a problem with my adsl line connected on a HWIC-ADSL on router 2901 it was working good until yesterday the atm interface is down but the interface dialer is up .i connected this line into home adsl modem and the line is working good?
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Nov 3, 2011
I have a client that has an ASA 5520 that has two internet connections, FIOS and Comcast. The ASA is configured to failover from the FIOS to the Comcast if the FIOS fails. This works perfectly fine. However, I was wondering if VPN and other inbound traffic will come into the secondary connection when it is active. I think VPN will work inbound when the FIOS connection fails, but I am not sure about the other inbound connections.
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May 22, 2012
how can I setup that the backup connection will start but after 30s of icmp timeout the default gateway (tracket object - 192.168.1.1)
My configuration:
sla monitor 123
type echo protocol ipIcmpEcho 192.168.1.1 interface outside
num-packets 3
frequency 10
sla monitor schedule 123 life forever start-time now
route outside 0.0.0.0 0.0.0.0 192.168.1.1 1 track 1
route backup 0.0.0.0 0.0.0.0 192.168.2.1 254
track 1 rtr 123 reachability
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Feb 14, 2013
The aDSL circuit is up and connected and I can reach the internet, however not all sites on the internet are reachable. This is occurring on two seperate 887VA’s and the circuit has been tested with a netgear router and no issues occur. The router has been tried on 5 different ADSL connections and the same problem occurs although more websites can be reached on a home broadband connection (ADSL2+ Annex A) as opposed to the problem being more severe on an ADSL2+ Annex M circuit. The problem seems to affect websites that are full of adverts more than sites that have single domain landing pages.
The sites that I cannot reach are pingable. This happens on multiple machines behind the router. The same config is used on an cisco 877-M router with no issues.
! Last configuration change at 14:52:30 UTC Wed Feb 13 2013
version 15.2
no service pad
[Code].....
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Mar 6, 2012
what will be the work around on this configuration.currently we have a Lease Line connection on serial interfaceISP <=SERIAL=>Router 2911<=ACCESS MODE=>Firewall(DATA DHCP SERVER located here, policy implemented here)<=TRUNK MODE=>CORE Switch(VLAN Assignment is here)<=TRUNK MODE=>ACCESS Switch(DATA and VOICE passess thru each ports)i am thinking to create a DHCP pool on the router to where my firewall should point to and from the DHCP pool it will point the internal network going to public network.
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