Full English Description for Cisco PIX-506
1. Official Short Order Description (Datasheet Standard Format)
Cisco PIX-506: Legacy compact desktop stateful inspection firewall from Cisco PIX 500 Series, targeted at mid-tier small branch offices and multi-user SOHO deployments, distinct from entry-level PIX-501 and upgraded PIX-506E refresh model. Equipped with two dedicated 10BASE-T Fast Ethernet ports (1 Outside WAN, 1 Inside LAN), running Cisco PIX OS 5.x (limited OS 7.x compatibility). Powered by Cisco Adaptive Security Algorithm (ASA), it delivers stateful firewall filtering, IPsec site-to-site & remote access VPN, inline intrusion detection, NAT/PAT, PPPoE broadband support, AAA authentication and multimedia VoIP protocol inspection. Performance metrics: up to 20 Mbps cleartext throughput, 25,000 concurrent TCP/UDP connections, maximum 25 simultaneous IPsec VPN tunnels, unlimited internal host capacity without restrictive user licensing. Managed via serial CLI, PIX Device Manager (PDM) web GUI, Cisco Secure Policy Manager (CSPM), SNMP and Syslog. End-of-Sale and End-of-Support legacy hardware, fully superseded by PIX-506E, ASA 5500 and modern Catalyst SD-WAN security gateways.
2. Complete Detailed Product Overview
Product Line Positioning
Launched as a mid-tier small-office firewall above the entry PIX-501, the Cisco PIX-506 was engineered for small branch sites requiring higher VPN capacity and unlimited internal host support, without the built-in 4-port switch of the PIX-501. It shares the core Adaptive Security Algorithm stateful inspection architecture with all PIX 500 series hardware, delivering enterprise-grade security for remote business locations, multi-user teleworker hubs and satellite retail offices.
The PIX-506 is the original base model; the later PIX-506E variant upgraded the CPU from 200 MHz to 300 MHz, boosted throughput to 100 Mbps and added full 10/100 auto-negotiation. The original PIX-506 only supports native 10 Mbps 10BaseT interfaces, lacks rack-mount capability, and reached End-of-Sale in 2004 with full End-of-Support in 2011, now obsolete hardware with no official firmware updates or Cisco technical support available.
Physical Hardware & Port Architecture
Form Factor & Mechanical Specs
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Compact dark gray plastic fanless desktop chassis, silent for indoor office placement only, no rack-mount brackets
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External DC power brick power supply; no internal redundant power feeds
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Front panel LED indicators: Power, Global Activity, Network link status
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Integrated physical security lock slot for anti-theft protection
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Fixed non-upgradeable hardware core: 200 MHz processor, 32 MB SDRAM, 8 MB flash storage for OS, configurations and local logs; memory and flash cannot be field-upgraded, chassis cannot be opened without voiding warrantyCisco
Rear Panel Fixed Port Layout
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1 × Outside 10BASE-T RJ45 WAN Port
Dedicated untrusted external interface for cable/DSL broadband modems, fixed 10 Mbps half-duplex operation on original PIX-506 hardware.
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1 × Inside 10BASE-T RJ45 LAN Port
Trusted internal interface to connect to external customer LAN switches for office workstation aggregation; no integrated built-in switch unlike PIX-501.
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RJ45 RS-232 Serial Console Port
Out-of-band local CLI management for initial device bootstrap and recovery operations.
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DC Power Input Jack
Receives 12V external AC-to-DC switching power adapter supplied regionally.
Core Performance & Licensing Limits
Throughput & Session Capacity
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Maximum cleartext firewall throughput: 20 Mbps
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Maximum concurrent TCP/UDP connection table entries: 25,000
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IPsec VPN encryption throughput:
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56-bit DES: Up to 10 Mbps
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168-bit 3DES: Up to 6 Mbps
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Maximum simultaneous IKE IPsec security associations (site-to-site + remote access): 25 concurrent tunnels抖音百科
Host Licensing
Unlike PIX-501 with hard 10/50 active user limits, the PIX-506 carriesno built-in host count license restriction, supporting unlimited internal LAN endpoints without upgrade keys. This is its key differentiation from the entry PIX-501 model for multi-user small offices.
Full Integrated Security & Networking Feature Suite (PIX OS 5.x Primary)
1. Stateful Inspection Firewall (Cisco Adaptive Security Algorithm)
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Full stateful packet inspection tracking all TCP/UDP connection state, eliminating stateless packet filter vulnerabilities
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Static, dynamic and turbo access control lists (ACLs) for granular inbound/outbound traffic control
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Multi-vector DoS/DDoS flood mitigation, malformed packet blocking and port scan detection
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Layer 7 application inspection engines for FTP, H.323, SIP, RTSP, NetBIOS and multimedia VoIP protocols to maintain NAT traversal for voice/video workloads
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Third-party partner URL filtering integration for outbound web content control
2. Standards-Based IPsec VPN Suite
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Site-to-site LAN-to-LAN IPsec tunnels for inter-branch secure private connectivity over public internet
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Remote access IPsec VPN for teleworker Cisco VPN Client software tunnels back to corporate headquarters
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IKEv1 key exchange protocol support, compatible with DES, 3DES encryption and MD5/SHA-1 authentication
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X.509 digital certificate enrollment via SCEP for scalable multi-site VPN deployments
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GRE tunnel encapsulation for routed non-IPsec traffic across VPN links
3. Broadband NAT & Routing Services
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Static one-to-one NAT, dynamic NAT pools, PAT port address translation for sharing single public IP across dozens of internal devices
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Native PPPoE client for DSL broadband ISP authentication and dynamic public IP assignment
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Local DHCP server for automatic internal LAN IP address allocation
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Static routing and policy-based routing (PBR); IPv4-only native support (no native IPv6 on PIX OS 5.x)
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Local DNS caching to reduce external DNS query latency
4. Inline Intrusion Detection & Threat Defense
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Built-in IDS engine with 55+ predefined attack signatures to detect exploits, worms and brute-force scanning
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Dynamic host blocking to automatically quarantine malicious source IP addresses after detected attacks
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Unicast Reverse Path Forwarding (URPF) anti-spoof filtering to block forged source IP traffic
5. AAA Access Control & Audit Logging
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Full AAA authentication, authorization and accounting via RADIUS and TACACS+ external servers
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Local user credential database for standalone device administrative login
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Persistent local event logging + remote Syslog export to external SIEM/log servers for compliance audit trails
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SNMP v1/v2 monitoring for device health, traffic utilization and fault alert reporting
Management & Configuration Tools
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PIX CLI Console: Traditional Cisco IOS-style command-line interface via serial console or SSH remote access
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PIX Device Manager (PDM): Embedded HTTPS web-based graphical GUI for single-device visual configuration, real-time traffic charts and security event reporting
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Cisco Secure Policy Manager (CSPM): Centralized enterprise policy management platform for bulk multi-PIX deployment orchestration
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TFTP image backup/restore for firmware OS and full configuration file archiving
Key Differentiators vs PIX-501 & PIX-506E
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vs PIX-501: No internal 4-port LAN switch, unlimited internal host license (no 10/50 user cap), higher 25,000 concurrent sessions and 25 VPN tunnel capacity
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vs PIX-506E: Slower 200 MHz CPU, fixed 10 Mbps 10BASE-T ports only (no 10/100 auto-negotiation), lower 20 Mbps cleartext throughput, limited OS compatibility (lacks full PIX OS 7.x support)
Typical Historical Deployment Scenarios
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Multi-user small branch office internet edge firewall for businesses with 10+ internal staff
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Regional retail satellite store secure VPN gateway connecting back to corporate headquarters
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Mid-sized teleworker hub for distributed field teams with unlimited internal wired endpoints
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Small remote branch backup VPN security appliance for redundant enterprise WAN connectivity
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Legacy network lab training platform for PIX OS stateful firewall and IPsec VPN learning environments
3. E-commerce Short Marketing Description
Cisco PIX-506 Legacy Mid-Tier Stateful Inspection Firewall, fanless desktop small-branch security appliance with separate 1×10M Outside WAN + 1×10M Inside LAN ports (no integrated switch), powered by Cisco Adaptive Security Algorithm PIX OS 5.x. Delivers unlimited internal host support, stateful SPI firewall, IPsec site-to-site/remote access VPN, inline IDS intrusion detection, NAT/PAT, PPPoE broadband and AAA authentication. Up to 20 Mbps cleartext throughput, 25,000 concurrent sessions and 25 simultaneous VPN tunnels, managed via serial CLI, PDM web GUI and CSPM centralized policy manager. Obsolete end-of-support PIX series firewall for multi-user small branch and remote office deployments, predecessor to upgraded PIX-506E model.
4. Product Catalog Keyword Tags
Cisco, PIX-506, PIX 500 Series Small Branch Security Appliance, Legacy Stateful Inspection Firewall, Mid-Tier SOHO Remote Office Firewall, Fanless Desktop Chassis, 1×10BASE-T Outside WAN Port, 1×10BASE-T Inside LAN Port, No Integrated Internal Switch, Cisco Adaptive Security Algorithm ASA, PIX OS 5.x Firmware, Stateful Packet Inspection SPI, IPsec IKEv1 Site-to-Site & Remote Access VPN, DES/3DES Encryption, Inline IDS Intrusion Detection System, NAT PAT Static Dynamic Address Translation, PPPoE DSL Broadband Client, AAA RADIUS TACACS+ Authentication, PDM PIX Device Manager Web GUI, Cisco Secure Policy Manager CSPM, Syslog SNMP Monitoring, 20 Mbps Cleartext Firewall Throughput, 25,000 Concurrent TCP/UDP Sessions, 25 Max Simultaneous IPsec VPN Tunnels, Unlimited Internal Host License, End-of-Sale End-of-Support Obsolete Hardware, Predecessor to PIX-506E Refresh Model, Small Multi-User Branch Internet Security Gateway
Naming Rule Explanation
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PIX: Cisco legacy dedicated firewall product family acronym (Private Internet Exchange), fully replaced by the ASA Adaptive Security Appliance line
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506: Mid-tier small-branch model number within the PIX 500 SOHO sub-series
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Distinction Suffix Rules: Base PIX-506 = original 200 MHz 10 Mbps hardware; PIX-506E = enhanced 300 MHz 10/100 Fast Ethernet refresh variant with higher throughput and full PIX OS 7.x compatibility
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Hardware Limitation Note: The original PIX-506 cannot be upgraded to support 100 Mbps interfaces or rack mounting, and lacks the internal Layer 2 switch found on entry PIX-501 hardware.
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