https://wiki.swcp.com/w/index.php?action=history&feed=atom&title=KB_104KB 104 - Revision history2026-10-06T22:34:58ZRevision history for this page on the wikiMediaWiki 1.45.1https://wiki.swcp.com/w/index.php?title=KB_104&diff=289&oldid=prevJamii: New page: ===How do I set up a Cisco 675 or 678 router to use a routed subnet (instead of NAT)?=== Article:104 Created:2002-07-16 18:02:51 Categories: routing DSL ====Question or Symptom==...2008-06-04T20:56:41Z<p>New page: ===How do I set up a Cisco 675 or 678 router to use a routed subnet (instead of NAT)?=== Article:104 Created:2002-07-16 18:02:51 Categories: routing DSL ====Question or Symptom==...</p>
<p><b>New page</b></p><div>===How do I set up a Cisco 675 or 678 router to use a routed subnet<br />
(instead of NAT)?===<br />
Article:104<br />
Created:2002-07-16 18:02:51<br />
Categories:<br />
routing<br />
DSL<br />
<br />
====Question or Symptom====<br />
How do I set up a Cisco 675 or 678 router to use a routed subnet<br />
(instead of NAT)?<br />
<br />
<br />
====Resolution====<br />
Once you flush the NVRAM, you will need to access the Cisco via a blue<br />
management cable connected to the serial port on your computer.<br />
<br />
To set the unit up for PPP mode we first need to flush the NVRAM. Type the <br />
following:<br />
enable<br />
set nvram erase<br />
write<br />
reboot<br />
<br />
<br />
This takes a minutes to reboot. Next we'll set up PPP. Use your email account<br />
login and password on the "login" and "password" lines.<br />
<br />
enable<br />
set ppp wan0-0 ipcp 0.0.0.0<br />
set ppp wan0-0 dns 0.0.0.0<br />
set ppp wan0-0 login Your_Email_Login<br />
set ppp wan0-0 password Your_Email_Login_Password<br />
set ppp restart enabled<br />
set dhcp server enabled<br />
set nat disable<br />
set interface vip0 ip <ethernet_ip_of_cisco><br />
set interface vip0 mask <subnet_mask_of_cisco><br />
<br />
The "dhcp" lines are optional. Only use them if you want the Cisco 675 to<br />
be your DHCP server. If you have another DHCP server on your LAN or if<br />
you assign static IPs to your machines, then you don't need to set up DHCP.<br />
<br />
set dhcp server pool 0 ip <pool_start_addr><br />
set dhcp server pool 0 netmask <pool_mask> <br />
set dhcp server pool 0 gateway <ethernet_ip_of_cisco><br />
<br />
If you have a 678 and your DSL protocol is DMT instead of CAP (all new Qwest<br />
DSL circuits after April, 2001 are DMT), then you need to enter these additional<br />
commands:<br />
<br />
set interface wan0-0 disable<br />
set interface wan0-0 vpi 0<br />
set interface wan0-0 vci 32<br />
set interface wan0-0 enable<br />
<br />
Next, save the new configuration and reboot the router:<br />
<br />
write <br />
reboot<br />
<br />
At this point any passwords you previously set will be gone, so you'll want<br />
to set a login and enable password. Please don't lose these!<br />
<br />
enable<br />
set password exec Your_Exec_Password<br />
set password enable Your_Enable_Password<br />
write<br />
<br />
<br />
Here is a specific example of what the "interface" and "dhcp" lines might look<br />
like. This is assuming a subnet of 216.184.23.16/29, with IP address<br />
216.184.23.17 assigned to the router, and addresses .18 through .22 assigned<br />
via DHCP:<br />
<br />
set interface vip0 ip 216.184.23.17<br />
set interface vip0 mask 255.255.255.248<br />
set dhcp server pool 0 ip 216.184.23.18<br />
set dhcp server pool 0 netmask 255.255.255.248<br />
set dhcp server pool 0 gateway 216.184.23.17<br />
<br />
<br />
====Related KB articles====<br />
[[KB 81]] How do I configure my Cisco 675 or 678 for Megabit service?<br />
<br />
[[KB 94]] How does one set up port forwarding on the Cisco 675 router?<br />
<br />
[[KB 95]] How does one change the internal IP address of the Cisco 675 router?</div>Jamii