06-25-2007 10:22 PM - edited 03-03-2019 05:36 PM
Hi all,
Hoping someone can assist with this.
I am setting up a 2851 with 3 x HWIC-1ADSL interfaces.
Each ADSL has it's own external IP address. What do I need to do in terms of routing in order to tell the router whatever data comes in on a given ADSL needs to go back out the same interface?
Is there a way I need to specify our ISP's default gateway address for each ADSL? (Each ADSL does have a different default gateway for the ISP)
Any assistance is greatly appreciated.
Thanks
06-26-2007 12:26 AM
Hi,
The only practical way is to use NAT. You should configure three NAT statements, one for each interface, and have three default routes.
How the default routes get installed, depends on the adsl configuration, eg, plain bridging with dhcp, PPPoE, etc.
So if you give us the specifics we can suggest something.
06-26-2007 04:00 AM
Hi,
Thanks for your prompt response.
Each ADSL has an IPSEC site to site connection back to our primary site. One ADSL is going to be used for MS SQL data, another ADSL for VoIP, and the final ADSL for everything else.
The other thing I have noticed is that when you specify 'bandwidth 512' on a Dialer interface, then so a 'sh int Di0' in the text which is output it says 'Available Bandwidth 384 kilobits'. Why is this?
Below is the config of the 3 ATM and 3 Dialer interfaces:
interface ATM0/1/0
description SQL ADSL
bandwidth 512
no ip address
load-interval 30
no atm ilmi-keepalive
dsl operating-mode auto
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
interface ATM0/2/0
description Voice ADSL
bandwidth 512
no ip address
load-interval 30
no atm ilmi-keepalive
dsl operating-mode auto
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 2
interface ATM0/3/0
description Main ADSL
bandwidth 384
no ip address
load-interval 30
no atm ilmi-keepalive
dsl operating-mode auto
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 3
interface Dialer0
description SQL ADSL
bandwidth 512
ip address negotiated
ip access-group 101 in
ip nbar protocol-discovery
ip virtual-reassembly max-reassemblies 32
encapsulation ppp
dialer pool 1
dialer-group 1
fair-queue 64 128 256
ppp authentication chap callin
ppp chap hostname
ppp chap password
crypto map cm-sql
hold-queue 224 in
interface Dialer1
description Voice ADSL
bandwidth 512
ip address negotiated
ip access-group 102 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip virtual-reassembly max-reassemblies 32
encapsulation ppp
ip tcp header-compression iphc-format
dialer pool 2
dialer-group 2
ppp authentication chap callin
ppp chap hostname
ppp chap password
crypto map cm-voice
hold-queue 224 in
ip rtp header-compression iphc-format
interface Dialer2
description Main ADSL
bandwidth 384
ip address negotiated
ip access-group 103 in
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly max-reassemblies 32
encapsulation ppp
ip tcp header-compression iphc-format
dialer pool 3
dialer-group 3
ppp authentication chap callin
ppp chap hostname
ppp chap password
crypto map cm-main
service-policy output pol-dialer2
hold-queue 224 in
ip rtp header-compression iphc-format
Thanks
06-26-2007 04:41 AM
This is all good. What matter is that you configure the following:
1. ip routing so that the VPN is established over the correct interface.
2. more ip routing, or possible policy-based routing so that the different applications will go out the correct interface and related VPN.
You can not use and ignore the bandwidth statements under dialer interface. The "available bandwidth" that it shows is related to voip QoS defaults, you can ignore that as the circuit will use anyway all the bandwidth available on the ADSL circuits. If you want to see at what speed the circuit have synced up, do "show dsl interface"
Hope this helps, please rate post if it does!
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