Cisco 1751 Router Behind ADSL Router

[Marwan Urabi]

Hi all.

it's possible to use the Cisco 1751 router without any add WIC , just use the build in Ethernet port behind Linksys or other ADSL router given from ISP,

and configure the Cisco 1751 to make and handiling the VPN traffic ?

if yes , how can I configure the Ethernet0/0 port ?

Best Regards

Marwan Urabi

[cadet alain]

Hi,

if the 1751 is the VPN gateway then it must have a public IP then you should set the ADSL router/modem  in bridge mode( that is to disable the router part) and use your 1751 as the router with the ADSL PPPoe on the ethernet interface connected to modem/router.

Regards

Alain

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[Marwan Urabi]

ok, what about use the Cisco 1751 without addithinal WIC , only 1 bulit in FastEthernet0/0 , i have small Cisco switch 2940 8 port ?

it's not easy to find the WIC for this model in our country.

Regards

Marwan

[cadet alain]

Hi,

that's what I was talking about previously and there are a lot of PPPoE configurations on an ethernet interface here in this forum.

Regards

Alain

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[Marwan Urabi]

Hi,

I can make PPPoE configurations and it's work perfictly , I make the config on other 1751 router but with 1ENET wic or 4ESW wic , but on this router i have one FE , so i coneected it to ADSL moden , but no one more WIC (ADSL or ENET or 4ESW ) to connect the router to local LAN , it's possible to connect the ADSL modem and Router to Cisco Switch and make the PPPoE ?

Best Regards

Marwan

[cadet alain]

Hi,

connect fastethernet to modem/router( in bridge mode) and do PPPoE on this fastethernet interface and connect the 4ESW interface to a switch if you need to connect more than 4 users in your LAN.

Regards

Alain

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[Leo Laohoo]

Alain. PM sent. 

[Marwan Urabi]

Any help pls .

Sent from Cisco Technical Support iPhone App

[Marwan Urabi]

Hi,

Thank you Mr Alain.

Sorry but there is no any WIC on the router if i have 4ESW the problem will solved , I ask if can connect the Modem and Router to Cisco switch and make sub interface on router to config LAN and WAN on the same FE with deferant VLAN ,

sorry for my bad english , but i hope it's clear what I mean .

Best Regards

Marwan

[Subeh Sharma]

Hi Marwan,

if you're thinking of configuring two sub-interface out of a single ethernet interface and then binding them to two different vlans, configuring one of these as PPPoE, i don't think that is a support design but you should try it out. It'll be interesting to see what happens.

int e0/0.1

switchport access vlan 1

int e0/0.2

switchport access vlan 2

int vlan 2

pppoe-client dialer pool-member 1

int dialer 1

ip add <>

encap ppp

dialer pool 1

dialer-group 1

ppp chap hostname <>

ppp chap pass<>

or if you have PAP authentication then instead of CHAP commands above, put ppp pap sent-username <> pass <>

exi

dialer-list 1 protocol ip permit.

ip route 0.0.0.0 0.0.0.0

or you can have the modem terminate the PPP connection and use vlan 2 as a normal vlan interface to get an ip from the modem.

Regards,

Subeh