Can you use both ethernet ports at the exact same time?

Depends on your ISP. The company I work for gives you 2 public IP addresses and you can get any combo of 2 computers, 1 computer and one router or 2 routers. You WILL NOT however get full speed on both at the same time but not half either. The modems we use now have only one ethernet port but if you hook up a simple switch you get both IPs through it. But ONLY 2.

Will this support xfinity extreme 1200mbps ? it's not on the supported device list.

The Arris S33 is a DOCIS 3.1 capable device 32 x 8 rated for speeds up to 2.5 Gb. While the modem is indeed on Xfinity supported device list (check detailed discussions on dslreports.com), what matters is your router. Ensure you have a router capable of 1+Gb speeds.

Does this modem support snmp?

NO. I wish that wasn't the case, but we have no SNMP access. No Arris home modems support user facing SNMP. The cable provider has management, but SNMP isn't exposed to the home network. From Arris: "SNMP (Simple Network Management Protocol) is not supported in Motorola Home Networking products. SNMP is included in Motorola Cable Modem and Home Gateway products, but it is intended for use only by the Cable Provider. There is no direct access to SNMP MIBs for the end-user."

Is one port for the router and the other port can be used for hardwiring a device (computer, etc) directly to modem?

The second port can only be used if connected to a separate/different IP. In other words, your ISP will have to give you 2 separate IPs. in order to use the second port.

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⚡ Unlock Multi-Gig Power & Save Big — Your Internet’s New Best Friend!

SAVE BIG ANNUALLY - Own your modem and slash rental fees, saving up to $168 per year on your cable bill.
NEXT GEN DOCSIS 3 1 - Cutting-edge technology delivering 10x faster speeds and reduced lag compared to DOCSIS 3.0.
PLUG PLAY SIMPLICITY - Effortless setup with SURFboard Central App—get online in minutes without hassle.
BROAD ISP COMPATIBILITY - Certified for Comcast Xfinity, Cox, Spectrum, and more—future-proof your connection.
BLAZING MULTI GIG SPEEDS - Experience ultra-fast 2.5 Gbps internet for seamless streaming, gaming, and remote work.

The ARRIS S33 is a DOCSIS 3.1 cable modem designed for multi-gigabit internet speeds up to 2.5 Gbps. Compatible with major U.S. cable providers like Comcast Xfinity, Cox, and Spectrum, it features 1 & 2.5 Gbps Ethernet ports, 4 OFDM channels for enhanced performance, and a 2-year warranty. Easy to set up via the SURFboard Central App, it helps users save on rental fees while future-proofing their home network.

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Brand	ARRIS
Product Dimensions	13.06 x 4.57 x 12.04 cm; 408.23 g
Item model number	S33
Manufacturer	CommScope
Series	S33
Colour	White
Number of Ethernet Ports	2
Wattage	120 watts
Are Batteries Included	No
Item Weight	408 g
Guaranteed software updates until	unknown

ARRIS(S33) - Cable Modem - Fast DOCSIS 3.1 Multi-Gigabit Modem For Comcast Xfinity, Cox, Spectrum & More 1 & 2.5 Gbps Ports 2.5 Gbps Max Internet Speeds 4 OFDM Channels 2 Year Warranty

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