Comcast Cable Modem Mimick Bridge Mode

I have an older SMC cable modem with comcast.  Trying to configure it so that my sonicwall configured with DDNS can identify my public IP.
Anyone know any tricks to accomplish this?

Comcast insists that I have to purchase a static IP.  I don't agree.

Best regards,
Craig
OnsiteSupportAsked:
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Matt KmetyEnterprise Application AdministratorCommented:
You shouldn't have to purchase a static IP. I ran into a similar issue with different equipment and I had to call Comcast and specifically tell them to turn the modem into bridge mode.

I had to really specify that I didn't want a virtual bridge mode. Some techs won't even know what you're talking about and try to sell you a static IP.

My advice would be to push back on Comcast since you can't turn Comcast modems into bridge mode anymore.

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OnsiteSupportAuthor Commented:
I was thinking I could set a DMZ to point at my sonicwall.  DDNS is picking up the IP of my router WAN port instead of the public ip of  the Modem.  But DDNS on the sonicwall doesn't know the WAN port on the modem?

i'm guessing this is bridge mode.   But thinking I could trick it somehow.
OnsiteSupportAuthor Commented:
I was off track a bit.  I DMZ'd the cable modem to my sonicwall.  Set the DDNS agent to pull the address from the DNS service instead of polling the WAN port.  problem solved.

Thanks for your input.
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