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New Member

ASA load balancing to two routers

Hi All,

Is there anyway I can load balance accross two routers.

I have an ASA with two routers attached each of the routers has two instances of HSRP running on them each with its own IP address, each router is the primary for one of the HSRP instances. If there was no ASA in the way I would set DHCP to run through one and all the server functions through another hey presto load balancing (of a sort). However I can not do this as the ASA has only one internal IP address. The routers are handling natting as they are on different IP ranges on different ISPs.

I can not use GLBP as the changing external IP would break connections for VPN RDP and SMTP.

Is there any way I can make the ASA route based on source IP or any other way of seperating out the traffic between the two routers?

Thanks in advance,

Scott

1 ACCEPTED SOLUTION

Accepted Solutions

Re: ASA load balancing to two routers

you cant route based on source ip with firewall only with router possiable by PBR

you can make to static routes each one point to deffrent router with deffrent metric

in this case it will make the topology like active standby which not good in your case

but you can use sub interfaces on your ASA intis case make each subinterface in deffrent subnet and deffrent security level

and let each subinterface use deffrent hsrp instance

or there is another way

IF you dont use VPN on your ASA u can achive it by useing multiple context

in multiple context you gonna separate your firewall virtualy

so if you have two vlans in your inside network (two deffrent subnets)

then each subnet will use deffrent firewall virtually

u goona divide the internal interface to two subinterfaces

and you can use one outside interface shred between the context or also separate it to two subinterfaces

and allocate those interface to each context

so you gonna deal with each context as deffrent firewall

and you can use deffrent HSRP instance on each context

but with multiple context you cant use VPN on the firewall

*****use the following method*****

THE OTHER WAY WHICH ALSO I SUGIST YOU TO TRY IT WHICH IS THE Transparent Firewall

in the case your firewall will operate in L2 mode

so you can use the routers HSRP IPS AS there is no firewall in the path

which i thnk helpful in you case aslo

in transperante mode the defaultgate way for your client will be the hsrp IP because the firewall will not have any IPs exept for managment

also the useres will be in the same IP subnet as the gateway in your case HSRP VIP

and also you can control the network security through the firewall normally

try this way and let me know

see the following link for configuration

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008089f467.shtml

please, Rate if helpful

3 REPLIES

Re: ASA load balancing to two routers

you cant route based on source ip with firewall only with router possiable by PBR

you can make to static routes each one point to deffrent router with deffrent metric

in this case it will make the topology like active standby which not good in your case

but you can use sub interfaces on your ASA intis case make each subinterface in deffrent subnet and deffrent security level

and let each subinterface use deffrent hsrp instance

or there is another way

IF you dont use VPN on your ASA u can achive it by useing multiple context

in multiple context you gonna separate your firewall virtualy

so if you have two vlans in your inside network (two deffrent subnets)

then each subnet will use deffrent firewall virtually

u goona divide the internal interface to two subinterfaces

and you can use one outside interface shred between the context or also separate it to two subinterfaces

and allocate those interface to each context

so you gonna deal with each context as deffrent firewall

and you can use deffrent HSRP instance on each context

but with multiple context you cant use VPN on the firewall

*****use the following method*****

THE OTHER WAY WHICH ALSO I SUGIST YOU TO TRY IT WHICH IS THE Transparent Firewall

in the case your firewall will operate in L2 mode

so you can use the routers HSRP IPS AS there is no firewall in the path

which i thnk helpful in you case aslo

in transperante mode the defaultgate way for your client will be the hsrp IP because the firewall will not have any IPs exept for managment

also the useres will be in the same IP subnet as the gateway in your case HSRP VIP

and also you can control the network security through the firewall normally

try this way and let me know

see the following link for configuration

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008089f467.shtml

please, Rate if helpful

New Member

Re: ASA load balancing to two routers

Thank you the transparent mode worked perfectly.

Re: ASA load balancing to two routers

i am glad its working :)

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