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Dlink ADSL router connect to Cisco Firewall

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I have problem with the network in our office.

Dlink ADSL router with PPPOE setting. And connect it from DLink LAN port 1 to Cisco eth0 port. Cisco eth1 connect to network switch. Previously can connect to internet.

After change Dlink ADSL router to other Dlink device due device power. All new setting same as previous Dlink Adsl ROUTER. Never change any setting inside cisco router. Now we cannot go to internet if connect behind the firewall. If connecting direct to ADSL router, there is no problem. Please advice

 

Thanks

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I have problem with the network in our office.

Dlink ADSL router with PPPOE setting. And connect it from DLink LAN port 1 to Cisco eth0 port. Cisco eth1 connect to network switch. Previously can connect to internet.

After change Dlink ADSL router to other Dlink device due device power. All new setting same as previous Dlink Adsl ROUTER. Never change any setting inside cisco router. Now we cannot go to internet if connect behind the firewall. If connecting direct to ADSL router, there is no problem. Please advice

 

Thanks

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