Cisco 1841 config

sabeshkhan · ‎08-20-2013

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

jawad-mukhtar · ‎08-21-2013

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

paolo bevilacqua · ‎08-21-2013

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.

sabeshkhan · ‎08-21-2013

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

jawad-mukhtar · ‎08-22-2013

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

sabeshkhan · ‎09-02-2013

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

cadet alain · ‎09-02-2013

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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sabeshkhan · ‎09-02-2013

Hi,

Thanks a lot for your reply.

So the remain commands are correct right?

I need only chnge in NAT overload right?

sabeshkhan · ‎09-16-2013

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

cadet alain · ‎09-17-2013

Hi,

yes failover will work.

Regards

Alain

Don't forget to rate helpful posts.

sabeshkhan · ‎09-18-2013

Hi,

Thanks for your replay.

I will try this and let you know

Thanks again.