cisco router configuration for Ethernet over Copper.
Need help configuring Cisco 1841 router and firewall.
My provider has put their equipment and given me 2 subnets with public ip address. I am used to getting just one Subnet and connecting my firewall straight to the hand off. But in this case I am a bit confused. I assume I will need to put a router and configure it with before I connect my firewall.
What make / model is this firewall you're talking about mike2002 ?
This is also HIGHLY dependent what exactly you want to do. If you only have one cable coming off the ISP-supplied equipment and/or want a single chain of devices from the ISP-supplied equipment, then you could configure a secondary ip address on the 1841 as follows :
ip address x.x.x.x [subnet mask here]
ip address y.y.y.y [subnet mask here] secondary
If the ISP-supplied equipment allowed it, or you didn't mind the setup, you could connect a layer2 switch and have the 1841 take the /29 subnet while your firewall did the /25.
reply to mike2002 If they routed the second subnet to the X.X.X.204 address, then assign 184.108.40.206 to the wan interface on your 1841 (lets use fastE0/0). For the other subnet, assign 20.xxx.97.129 to the other interface on your router (lets use fastE0/1). Connect your firewall to the the FastE0/1 and assign it an IP address out of the second subnet. Configure your firewall.
reply to mike2002 It's a little odd that they give you a /29 with a gateway of 201 but your first usable is 204. Your first usable should be 202. Perhaps this is a shared circuit with other people in your building?
You have the option of setting your firewall up with single IP of 220.127.116.11 and ignoring the /25 or using the /25 without the 1841. If that's the case and you don't need or will use the /25 return it to the ISP.
If you need or must use the 1841 you can use it as follows:
interface FastEthernet0/0 description metro-e circuit id carrier tmc phone number ip address 18.104.22.168 255.255.255.248 duplex full speed 100 no cdp enable ! interface FastEthernet0/1 description Customer Network ip address 200.xxx.97.129 255.255.255.128 no cdp enable
ip route 0.0.0.0 0.0.0.0 22.214.171.124 name default-route-to-isp-a
Then connect your firewall to FA0/1 and use 209.xxx.97.130 as the address or you have the option of subnetting the 209.xxx.97.128/25 further by adding vlans or routes to other networks you may need. -- I do not, have not, and will not work for AT&T/Comcast/Verizon/Charter or similar sized company.