Cisco 837 is a router manufactured by Cisco Systems

Cisco Systems

Cisco Systems, Inc. is an American multinational corporation headquartered in San Jose, California, United States, that designs and sells consumer electronics, networking, voice, and communications technology and services. Cisco has more than 70,000 employees and annual revenue of US$...

 intended for SOHO network use. The device is typically used as an internet router via its ADSL WAN

Wide area network

A wide area network is a telecommunication network that covers a broad area . Business and government entities utilize WANs to relay data among employees, clients, buyers, and suppliers from various geographical locations...

 port. It also incorporates an integrated 4-port Ethernet 10/100 Mbps switch for local device connectivity.

The Cisco 837 runs a Cisco IOS

Cisco IOS

Cisco IOS is the software used on the vast majority of Cisco Systems routers and current Cisco network switches...

 operating system and supports firewall, NAT (Network address translation

Network address translation

In computer networking, network address translation is the process of modifying IP address information in IP packet headers while in transit across a traffic routing device....

) / PAT (Port address translation). The device also provides support for the use of multiple public IP addresses on its external WAN port.

The device is also capable of acting as an IPSEC VPN gateway for remote connectivty. Cisco Systems provide a VPN client to use with this device and many other of its Cisco VPN capable products. The 837 differs from the 827 as it features hardware acceleration of Triple DES

Triple DES

In cryptography, Triple DES is the common name for the Triple Data Encryption Algorithm block cipher, which applies the Data Encryption Standard cipher algorithm three times to each data block....

 encryption, enhancing VPN performance. The 827 was available as a SOHO 7x and the 837 was available in some regions as a SOHO 9x, where x is 1 for Ethernet, 6 for ADSL over ISDN, or 7 for ADSL over POTS

Plain old telephone service

Plain old telephone service is the voice-grade telephone service that remains the basic form of residential and small business service connection to the telephone network in many parts of the world....

.

This router is no longer supplied by Cisco.

Physical

• Device type – router + 4 port switch (integrated)
• Form factor – external
• Dimensions (WxDxH) – 24.6 cm x 21.6 cm x 5.1cm
• Weight – 0.7kg
• CPU – Motorola, MPC857DSL running at 66MHz
• RAM – 32MB installed in original model, 64MB in later models. Max is 80MB. Expansion using onboard DIMM-socket.
• Flash memory – 12MB (installed) / 24MB (max). (8MB / 16MB for early revisions) Expansion using onboard StrataFlash
  StrataFlash
  StrataFlash is a NOR flash memory technology first developed by Intel.It stores two or more bits of information per cell rather than just one, in an architecture called Multi-Level Cell . This is accomplished by storing intermediate voltage levels instead of using only the two levels of...
  
  -socket.
• Digital signaling protocol – ADSL1
• ADSL chipset - ST-Micro DynaMiTe 20150 (former Alcatel Micro Electronics)

Software and features

• Routing protocol – IGRP, RIP-2, GRE
• Data link protocol – Ethernet, FastEthernet
• Network/transport protocol – TCP/IP, PPtP, IPSec, PPPoE, PPPoA
• Remote management protocol – SNMP, telnet, HTTP, SSH
• IOS firewall
• NAT/PAT

Popular uses and applications

• Providing VPN access for remote users / teleworkers
• Internet gateway