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New Member

Cisco 1841 config

Hi,

I have two broadband connections from different internet service providers and I dont have a static ip.

I thought to use cisco 1841 for these connections because Cisco 1841 has two wan ports.

If anyone knows how to configure this with 1841 ( I have username and password for both connection) please help me

just try to give me sample configuration.

thank you


10 REPLIES

Cisco 1841 config

interface FastEthernet0/0

no ip address

pppoe enable

pppoe-client dial-pool-number 1

this links to dialer interface

interface Dialer0

ip address negotiated

ip mtu 1492

ip nat outside

encapsulation ppp

ip tcp adjust-mss 1414

no ip mroute-cache

dialer pool 1

dialer idle-timeout 0

dialer-group 1

ppp authentication pap callin

ppp chap hostname abc

ppp chap password def

ppp chap refuse

!

ip route 0.0.0.0 0.0.0.0 Dialer0

on internal interface

int f0/1

ip address 192.168.1.1 255.255.255.0

ip nat inside

!

ip nat inside source list 101 interface Dialer0 overload

access-list 101 permit ip 192.168.1.0 0.0.0.255 any

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HTH

Jawad

Jawad
Hall of Fame Super Gold

Cisco 1841 config

interface Dialer0

ip address negotiated

ip mtu 1492

ip nat outside

encapsulation ppp

ip tcp adjust-mss 1414

Incorrect, should be 1452.

dialer idle-timeout 0

ppp chap refuse

These commands are not needed.

New Member

Cisco 1841 config

Hi,

Thank you for your answer.

this is only for a single port I need to use the both WAN ports with two different connections is this is possible? I have a HWIC card with my router so I hope to out the both connections via the HWIC is it possible?

If yes please help me

Cisco 1841 config

track 1 interface Dialer0 ip routing

delay up 30

!

track 2 interface Dialer1 ip routing

delay up 30

!

ip route 0.0.0.0 0.0.0.0 Dialer0 track 1

ip route 0.0.0.0 0.0.0.0 Dialer1 track 2

ip nat inside source list 101 interface Dialer0 overload

ip nat inside source list 101 interface Dialer1 overload

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Jawad

Jawad
New Member

Cisco 1841 config

Hi,

thanks for your reply again

I tried use both pppoe connections.

If I use this configuration is the dialer 2 interface works as a failover?

is this configuration is correct?

if any thing wrong please help me.

Router(config)#int vlan 1

Router(config-if)#ip add

Router(config-if)#ip address 192.168.100.5 255.255.255.0

Router(config-if)#int dialer 1

Router(config-if)#mtu

Router(config-if)#mtu 1492

Router(config-if)#ip address negotiated

Router(config-if)#ip nat

Router(config-if)#ip nat ou

Router(config-if)#ip nat outside

Router(config-if)#ip virtual-reassembly

Router(config-if)#encapsulation ppp

Router(config-if)#ip tcp ad

Router(config-if)#ip tcp adjust-mss 1412

Router(config-if)#dialer pool 1

Router(config-if)#dialer-group 1

Router(config-if)#ppp authentication chap callin

Router(config-if)#ppp pap sent-username username1 password  0 123456

Router(config-if)#exit

Router(config)#int dialer 2

Router(config-if)#mtu 1492

Router(config-if)#ip address negotiated

Router(config-if)#ip nat outside

Router(config-if)#ip virtual-reassembly

Router(config-if)#encapsulation ppp

Router(config-if)#ip tcp adjust-mss 1412

Router(config-if)#dialer pool 2

Router(config-if)#dialer-group 2

Router(config-if)#ppp authentication chap callin

Router(config-if)#ppp pap sent-username  username2 password 0 123456

Router(config-if)#exit

Router(config)#int fastEthernet 0/1

Router(config-if)#pppoe enable

Router(config-if)#pppoe-client dial-pool-number 1

Router(config)#int fastEthernet 0/0

Router(config-if)#pppoe enable

Router(config-if)#pppoe-client dial-pool-number 2

Router(config)#ip dhcp pool test

Router(dhcp-config)#network 192.168.100.0 255.255.255.0

Router(dhcp-config)#default-router 192.168.100.5

Router(dhcp-config)#dns-server  119.235.0.4 203.81.108.4

Router(config)#ip dhcp excluded-address  192.168.100.0.1 192.168.100.20

Router(config)#ip classless

Router(config)#ip route 0.0.0.0 0.0.0.0 dialer 1

Router(config)#ip route 0.0.0.0 0.0.0.0 dialer 2 100

Router(config)#access-list 101 permit ip 192.168.100.0 0.0.0.255 any

Router(config)#ip nat inside source list 101 interface dialer 1 overload

Router(config)#ip nat inside source list 101 interface dialer 2 overload

Purple

Cisco 1841 config

Hi,

1)

For NAT overload on 2 WAN connections you need to use route-maps :

route-map DIALER1

match ip add 101

match interface dialer 1

route-map DIALER2

match ip add 101

match int dialer 2

ip nat inside source route-map DIALER1 interface dialer 1

ip nat inside source route-map DIALER2 interface dialer 2

2) the the TCP MSS can be up to MTU-40 so here 1452

3) you are doing CHAP authentication but are providing PAP credentials,you should provide CHAP credentials with the ppp chap hostname and ppp chap password commands

Regards

Alain

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New Member

Cisco 1841 config

Hi,

Thanks a lot for your reply.

So the remain commands are correct right?

I need only chnge in NAT overload right?

New Member

Cisco 1841 config

Hi thanks for your help,

One more thing I have to ask,

Is failover will work with this configurations? because that's why I placed two different static routes with different AD.

if not help me to config a failover with this 1841 router....

please help me

Purple

Cisco 1841 config

Hi,

yes failover will work.

Regards

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
New Member

Cisco 1841 config

Hi,

Thanks for your replay.

I will try this and let you know

Thanks again.

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