Cisco WAN :: Configuring Internet Failover On 2821 Using IP SLA
Mar 2, 2011
We have multiple cisco routers and most of them have dual WAN connections thru different ISPs. So, we use IP SLA monitor with tracking object s to monitor each ISP availability/reliability and switch routing accordingly ( by IOS). So far, it has been working ok. However, recently, we had some ISP high latency and the connection to one ISP will be so slow but the IOS keep seeing it as UP, thus sending traffic thru it. So, I tried to change around the threshold numbers around with no luck. Is there any configuration/commands or tricks that can do the job here? I don't want the users to be the one to detect the Internet slowness and have me manually shut down an interface or change the static routes metrics. here is a sample of my config:
ip sla 1 type echo protocol ipIcmpEcho x.x.x.x isp 1 gateway threshold 3 frequency 5ip sla monitor schedule 1 life forever start-time now
ip sla 2 type echo protocol ipIcmpEcho x.x.x.x isp 2 gateway threshold 3 frequency 5ip sla monitor schedule 2 life forever start-time now
[Code]......
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Jun 13, 2012
Currently I'm looking for a way to failover our internet connection from one site to another site over our MPLS line, should that internet connection go down.
My layout: Internet > Cable internet modem (Site B) > ASA 5510 (Site B) > 2821 Router (Site B) > MPLS Line > 2821 Router (Site A) > ASA5510 (Site A) > ISP provider internet router (Site A) > Internet
Facts:Site B is the one with the internet issues.The MPLS line is routed using BGP. [URL]
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Jun 5, 2011
I have Cisco 2821 router, using it to learn various features. I just recieved this router recently. I wanted to connect it to my cable modem so I can access the outside world. Also when I overload a new interface comes up NVI0, which is nat vertual interface, but anyways.
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Sep 25, 2012
I have an issue where we have a single ASA5505 [soon to be active/standby with single ISP] connecting to HQ where there are 2 x Cisco 2821's. Each 2821 router has it's own connection to the internet running BGP and each router is setup to terminate IPSEC VPN's from the ASA. The ASA has a backup VPN configuration with no IP SLA configuration to track if the Primary IPSEC endpoint is alive. Keep alives are set and the VPN does failover to the backup.When the primary 2821 internet connection fails the ASA fails over to the backup 2821 and everything works a dream. However when the primary internet link re establishes to the primary 2821 the ASA does not fail back to the primary 2821 it stays on the backup 2821 and all is broken as the remote site starts forwarding traffic out the BGP default route - which is back via the primary connection...How do I fix this so that the ASA tracks the IP of the primary router to failback without manual intervention - clearing isakmp and ipsec sa's?The other issue is the ASA does not allow traffic to be orignated from the 2821 end of the VPN. You have to establish traffic from behind the ASA for the IPSEC sa to be created.
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Mar 10, 2013
Most of my remote site is running MPLS primary (2821) and DMVPN (881) as a backup solution..Some of my sites run MPLS primary on 2821 and site to site as back up on 881 router.. MPLS here means the router that connected me to MPLS cloud of provider, not running any mpls..it is easy that way for us..
When MPLS is down,
The way s2s tunnel gets triggered is via HSRP on LAN i.e, the HSRP VIP is served by the 881..At the far end data center, the MPLS route of remote site is purged out, there is static route with higher admin distance will get into routing table.
Remote site A LAN----- MPLS Router-----MPLS cloud-------MPLS router----------------Data Center LAN
Remote site A LAN----- DSL Router-----internet cloud--------Data center ASA----------Data Center LAN
In the MPLS plus s2s model, I often get into problem...the problem is how do I manage the 881 router via snmp, ccm , tacacs or any other management tools? There is a routing issue in hand that I canno route to and from to the mgt address of DSL. I cannot reach the loopback or mgmt vlan of the DSL router when the MPLS is active…but this will disallow all the management stuff we do on the DSL router.
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Jul 2, 2012
Currently I have a network that looks like this:
ASA5510 - - - Internet - - - ASA5510
| |
EIGRP EIGRP
| |
2821 -----------MPLS----------1841
BGP
The MPLS connection is currently down, I'm trying to run a failover Site-to-Site VPN over the internet. All of the examples I've read have both connections involved in the failover coming out of one device. Since I'm not working that way, what is going to be the best way to failover? Do I need to set up some sort of IP SLA in the config? Or can I somehow weight routes in EIGRP in a way that the connection will failover from Internet to MPLS when the MPLS goes down and vice versa when the MPLS connection comes back up?
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Apr 2, 2013
I'm a bit perplexed atm with trying to set up multiple failover routes on a 2821 router. Let me say that I have more experieince in a switched network as routing is seldom required where I work atm. Here's my problem. I have a routing table set up as follows but only the primary routes work. The failover routes will not kick in once the primary route is not there.
ip route 10.32.11.0 255.255.255.0 128.32.8.11
ip route 10.32.11.0 255.255.255.0 128.32.24.11 100
ip route 10.32.12.0 255.255.255.0 128.32.8.12
ip route 10.32.12.0 255.255.255.0 128.32.24.12 100
ip route 10.32.14.0 255.255.255.0 128.32.8.14
ip route 10.32.14.0 255.255.255.0 128.32.24.14 100
Ip addresses are not exact but it gets the point across.
Why the failover routes are not failing over? The failover routes work if I remove the primary route from the config.
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Oct 16, 2012
I have two ASA 5510's that I want to setup in a Active/Standby configuration. My only question is on how to connect the inside ports to my LAN. I have 5 Catalyst 3750's stacked together that connect to the ASA's. Should I run the inside interface on ASA1 to a port on switch 1. Then run the inside interface on ASA2 to a port on switch2? And make sure both those ports are in the same VLAN? But, then when failover occured, how to I automatically make it clear the arp cache so the traffic starts flowing out of the right port?
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Aug 6, 2012
I have an issue with configuring the VPN Stateful failover between two cisco routers 3845. The stateful HA is not up.
Below is the topology
Configuration on HA-1
interface GigabitEthernet0/0
ip address 194.170.9.183 255.255.255.240
ip accounting output-packets
duplex auto
speed auto
[code]....
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Nov 13, 2012
I am using a Cisco 1921 with a Verizon 4G LTE card installed. The primary connection is a Cable Modem with the 4G LTE acting as the backup. I've setup a track on the static route to the primary ISP. I'm having multiple issues. Initially I used the Gig 0/0 int instead of a Loopback address for the IP SLA source. The IP SLA traffic would be sent to the cellular interface and cause an IP source violation and the interface would flap. Then I used the Loopback and I could not get the route to fail back when the connection came back up. Even with the Loopback as the source for IP SLA I'm still getting flapping and I think that is a NAT configuration issue. I've applied an access-group on the cellular interface to try to fix the ip source violation issues, but it doesn't appear to work. The IP-SLA-POLICY route map is an attempt to force the IP SLA traffic to the primary interface. [code]
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Mar 26, 2011
I've two Cisco ASA 5550 firewall. I'm don't have much knowlege on configuring this kind of firewall. I need configuring these firewall for simple NAT. I have 3 public IP address. I would like to allow server's inside of the firewall to be able to connect to internet using private address. A basic NAT. Also need to configure some port forwarding. We've bought two firewall for the Active/Active failover support. How can i configure this through ASDM? My ASDM version is 5.2.
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Sep 15, 2011
We configuring ASA 8.4.2 in Active/Standby failover mode with two cables. What would be the best design configuring etherchannel on ASAs or have one active and one standby redundant cable ?
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Mar 11, 2012
I am sitting on Internet and want to copy IOS Image to router. I can SCP, itu authenticated to Router but ends with a message "host is not communicating for more than 15 seconds".
Router : Cisco 2821
Current IOS: (C2800NM-ADVENTERPRISEK9-M), Version 12.4(24)T1.
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Aug 12, 2012
I am looking for a simple router recomendation for multihoming dual 100Mbps internet connections with BGP routing. What are the current best practices regarding required resources for the full Internet BGP routing table? We were thinking of specing a 3945 for this application, but is that overkill? The customer has a 2821 that is not in use, I'm thinking this would be too slow for Internet BGP routing combined with the 100Mbps line speed.
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Jan 5, 2012
On a 2821 Router with 15.1(3)T1
I have an IPSec VPN and NAT configured. Return traffic from an internal NAT host seems to be blocked by the WAN inbound ACL. What is the proper way to allow return traffic from the Internet for this internat NAT host? Note: As a test, removing the deny entry on the WAN ACL allows return traffic.
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May 8, 2013
What is the best way to monitor an Internet Edge router from the Internal network behind the Firewall?We want to pull more information from the edge router like netflow. We can use SNMPv3 and ACLs to keep the router secure.
But I am looking for the best config to keep both the router and firewall as secure as possible while still allowing us to monitor performance and faults.I am running an ASA and a 2821.
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Sep 22, 2011
sample configuration for internet failover . i have 2 ISPs with one coming in thought a serial cable and another through internet and would wish one take over after the other has failed .The router is Cisco 1921 .
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Oct 16, 2012
There are four figures(A,B,C,D) shown in attached diagram.my aim to achieve wan side failover, mean to say, if one ISP or Router goes down, the other should still be reachable.
Cisco 2960 = L2 Switch
Cisco 3560 = L3 Switch
Here I am discussing only two redundancy methods i.e Floating Static route and IP SLA. There are following questionnaires related to attached diagram given below
Figure A:
1. Floating static route (Yes or No)
2. IP SLA (Yes or No)
Figure B:
1. Floating static route (Yes or No)
2. IP SLA ( Yes or No)
Figure C:
1. Floating static route (Yes or No)
2. IP SLA ( Yes or No)
[code].....
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Mar 27, 2013
I wanted to configure failover internet between two routers Cisco 3800 Series. Each router is connected to an ISP. I have configured HSRP protocol on my interfaces and my HSRP configuration works well. I want to configure my routers to switch my internet traffic in case of failure. For example,if the first ISP internet connection fails, traffic will switch at the second ISP. I want to know how I should proceed to do this.
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Jun 1, 2011
I am putting together a solution for a client. The client has an MPLS circuit and internet as a backup circuit. I understand that we can do WAN failover using ASA5510 appliance.Now, if i am adding dual ASA5510 active/standby mode, How do i automatically failover WAN circuits to standby firewall if both MPLS and Internet circuits are connecting to primary ASA5510. Should i connect MPLS circuit to ASA1 and Internet circuit to ASA2? Ideally, i want both circuits to connect to primary ASA5510 for automatic WAN failover. My concern is , if the primary ASA5510 fails which has WAN and Internet circuits connected , do i need to manually switch connection from primary to standy? The goal is to fully automate wan failover and asa failover .
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Apr 6, 2013
configure a router 1812 as failover, I walk with fixed ip internet link in Fe0 (need to determine the mac) and a dynamic ip link in FE1, other ports with a single vlan dhcp 172.20.16.1
I managed to do DHCP, connect to internet, to make nat vlan. But I could not do failover and load balance neither.
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Apr 5, 2013
I am having a cisco 861 series router.The Cable from the isp was connected to fastethernet4(wan port)
Following are my isp details
IP address:172.16.62.130
subnet:255.255.0.0
default gate way:172.16.62.1
dns primary:202.153.32.2
secondary:202.153.32.3
How do i configure this details in the router and access the internet in my devices.i want the network to be in 192.168.1.0 to 254.
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Nov 29, 2012
I am going to use a DQ77BK motherboard, which does "dual band" LAN. I have been told that with this, i can use two internet connections (from two different providers), so that when one fails, my computer still uses the other one. As you have understood, i need to be safetly connected to internet. I cannot have internet switched off in the middle of my work.
So, what do i need to do this ?
- Do i need 2 wifi cards, or would 1 "dual band" wifi card (like the Intel centrino 6200) be enough to handle it ?
- Do i need two antennas ?
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Aug 24, 2012
I have 2 cisco 6500 switches with FWSM running HSRP with an ISP. I need to add another ISP into this configuration for ISP failover. The original ISP i.e ISP 1 has given us a Vlan and we have configured a default route into the FWSM to go through it. Now i have 2nd ISP which has given us another Vlan but i would like to know how can i configure default route for this 2nd ISP as i already have one for the 1st ISP.
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Feb 22, 2012
i have a new server but the ISP gave me this address
IP 41.221.92.150
S/Mask 255.255.255.252
Gateway 41.221.92.145
P/DNS 41.221.87.2
A/DNS 41.221.81.132
how should I configure my server and the client cpu?
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Aug 21, 2012
configuring 2620 cisco to cable modem for internet.I'm setting up a lab to practice and am having trouble getting this to work.Made several configs that don't work and starting over form scratch.
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Jun 1, 2011
I have a small lan of around 10 computers in my office which are connected through a switch connected to a airtel broadband connection. I want to configure a network server so that I could manage an control the internet traffic used by all the workstations in the lan through that server. All the workstations have either WinXP or Windows 7 on it. I haven't purchased a server. I want to use a desktop(having some good configuration) as my network server.
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Jan 14, 2013
I have a home wi-fi network that connects through a router/modem to the Internet. There are three up-to-date Windows Vista (Home edition, I think) laptops on the network all of which connect wirelessly to the router/modem. The network is password protected (for security purposes I turn off network discovery. And I don't use file sharing between the laptops). In other words, I have three laptops connected to a common wireless Internet connection (the router/modem). I also have a desktop computer (that I use for projects and gaming), but I don't have a wireless network adapter nor a long enough ethernet cable to connect to the router. I don't have any technical problems connecting to the Internet using a crossover ethernet cable. It's just impractical as I have to dismantle the whole desktop computer system (printer, monitor, scanner, etc etc) and carry it to a different room within cable distance of the router every time I need to update the software or activate a new application.
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Jan 29, 2012
Here is what I have. Windows Domain Controller running DHCP with configured scopes.I have one ASA5510 And 4 HP Procurve switches with VLANS preconfigure from vender.
Here are my DHCP scopes/VLANS:
VLAN1 -Default 10.2.x.x/17
VLAN201 -DHCP 10.2.201.x/24
VLAN202 - WLAN EMP 10.2.202.x/24
VLAN203 - WLAN Guest 10.2.203.x/24
VLAN 252 - MGMT 10.2.254.x/24
Here is how I configured the DHCP Scopes:
Changes needed to make to the DHCP Server (AUSPDC) in order to get things working with the new switches.
1) Configure 3 new DHCP scopes on your DHCP server.
a) scope for 10.2.201.x/24 to serve LAN employees and give them a gateway address of 10.2.201.254.
b) a scope for 10.2.202.x/24 to serve WLAN employees and give them a gateway address of 10.2.202.254.
c) a scope for 10.2.203.x/24 to serve WLAN Guests and give them a gateway address of 10.2.203.254.
I just upgraded and decided to go with the VLAN configuration. None of my VLANS can get out to the internet or each other due to I think My ignorance in configuring the firewall.The PC's are getting proper IP address but they cannot get out or to the other VLANs. I tried to duplicate what is working for VLAN1 but it is not working.
Here is my config.
Result of the command: "show running-config"
: Saved
:
ASA Version 8.2(3)
!
hostname CiscoASA
domain-name hand.local
enable password 1FVULuGal5s1/ADt encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
[code].....
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Feb 8, 2012
I am using a broadband internet of a provider named BSNL,through a simple modem. Recently I got a Beetel 450BX1 ADSL2 + Router and want to use the wireless capability of the laptop so that I don't have to be glued to my table. The OS I'm using is Windows 7 Ultimate (32 bit) on an HP Compaq 6515b.I configured the modem by following the instructions in the following link url...I believe that's a straightforward method for configuring a router, and that accomplishing this is very simple.I followed the steps, only changed the username and password to that given by BSNL.Then, finally I unplugged the LAN cable and clicked on Connect to <connection name>, punched in the serial key. But it does not connect and says "Windows was unable to connect". Even after using Windows Network Troubleshooter the problem is not solved.
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Jul 5, 2012
I use vmware workstation, and doing small networking project.i use 1 windows server 2008 x64 sp1 as DC, DNS and DHCP with 2 nic(1 nic for local(vmnet2) and 1 for internet(NAT)) and i use 1 windows 7 client machine.in server local nic settings are ip 200.200.200.1 sm 255.255.255.0 gw: empty dns 200.200.200.1
and internet nic settings all set automatic.and in DNS i added forwarder as my company's actual DNS server name.My requirement is client should browse internet by resolving through my dns server.but the problem is my server is having internet but my client windows 7 does not have internet
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May 28, 2011
I recently configured a linksys range extender to my modem and since doing that, I'm getting a message stating that there is an IP address conflict with another system on the network. When I set up the range extender, I assigned an IP address to it that was different from the modem but yet this message still appears. Also even though my wireless connection is connected, I'm unable to connect to the internet - I keep getting the message 'internet explorer cannot display webpage'.
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Dec 6, 2011
I have router cisco 2821 wit IOS version 12.4(25d) I also have Cisco AIM-VPN/SSL-2 Encryption Module for this router.I inserted this module in AIM slot 0 but can not see it. [code] What should I have to change to enable this module?
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