New modem on pfsense?
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Would connecting a new modem (not a modem-router hybrid) on a pfsense router require a reconfiguration?
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Would connecting a new modem (not a modem-router hybrid) on a pfsense router require a reconfiguration?
Depends. For example, if the WAN side of your existing modem talks pppoe and the WAN side of your pfSense doesn't and your new modem-only interface doesn't support pppoe then you will need to reconfigure your pfSense WAN interface to talk pppoe.
That is the change I had to make when I replaced an ADSL modem-router by a basic ADSL modem.
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So it's plug and play when the Internet connection is DHCP while there is a configuration needed when the it's in PPPoE? Am I understanding it correctly?
Is the configuration of the Internet connection only done in Interfaces > WAN/OPT1?
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Yes to those questions but…
From the questions you are asking it seems as though you are trying to reconfigure a pfSense box you didn't setup yourself? Please explain your situation a little more so we can provide a more helpful level of answer! :)
Steve