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CISCO1801/K9
ADSL/POTS Router with Firewall/IDS and IPSEC 3DES
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CISCO1801/K9 is a fixed enterprise router engineered for branch office connectivity and integration of multiple services, offering a robust architecture with flexible power options through an AC power supply and dual WAN configurations. It delivers secure connectivity with integrated VPN features and built-in firewall capabilities while providing high QoS performance for voice, video, and data convergence with modular expansion slots for network interface modules.
Designed for scalability and optimized for diverse use cases in enterprise environments, the device features 10/100 Ethernet interfaces for LAN connectivity, integrated services that support voice and video applications, and reliable throughput capacity with essential redundancy features. Its performance and modular capabilities make it ideal for secure branch office deployments, demanding VPN applications, and comprehensive remote management in wired networks.
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| CISCO1801/K9 |  C1861W-SRST-B/K9 |  CISCO1802 |  CISCO1801 |  CISCO1841-HSEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Modular |
| Broadband | N/A | N/A | DSL | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | FCC / CE | FCC, CE, UL | IEEE 802.3, 802.3u, 802.3ab | FCC / CE | FCC / CE |
| Connectivity Type | Wired | Wired / Wireless | Wired | Wired | Wired |
| Depth | 14 in | N/A | 13 inches | 15.7 inches | 10.8 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | FCC, CE | FCC | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100/1000 | 10/100 | 10/100 |
| Expansion Slots | NIM | NIM | NIM, EHWIC | EHWIC | EHWIC |
| Features | VPN / Voice / Firewall / IPv6 Compatible | VPN, Firewall, Integrated Services, IPv6 Compatible | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / VoIP / IPv6 Compatible / Firewall | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 256 MB | 256 MB | 128 MB | 32 MB |
| Form Factor | Rack-mount | Desktop | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 in | N/A | 1.75 inches | 1.73 inches | 1.75 inches |
| High Availability Support | Not Supported | Supported | Supported | Not Supported | Supported |
| Integrated Services | Voice / Video | Voice, Video | Voice, Video, WAN Optimization | Voice / Video | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45, Combo Ports | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 2 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 256 MB | 512 MB | 256 MB | 128 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4, IPv6 | IP, TCP, UDP, HTTP, SNMP | IPv4 / IPv6 | IP / IPv6 |
| Power | 48 W | 40W | 150W | 85 Watt | 65 Watt |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply with Redundant Option | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1801 Integrated Services Router | Cisco 1861 Wireless Services Router | Cisco 1802 Integrated Services Router | Cisco 1801 Integrated Services Router | CISCO1841-HSEC/K9 |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI / SSH / Telnet / SNMP | SSH, Telnet, SNMP | Telnet, SSH, SNMP, HTTPS | CLI / SNMP | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | UL, CE | FCC / UL | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | N/A | N/A |
| Stacking Capability | No | No | Yes | No | No |
| Telecom | N/A | N/A | ETSI | N/A | N/A |
| Throughput Capacity | 0.075 | 0.085 Gbps | 1 Gbps | 0.027 Gbps | 0.033 Gbps |
| Use Case | Enterprise | Business / Small Business | Enterprise / Business | Small Business / Enterprise | Business / Enterprise |
| VPN Support | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN / GRE | IPSec / SSL VPN | IPSec | IPSec / SSL VPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 12 lbs | N/A | 15 lbs | 13.2 lbs | 11.9 lbs |
| Wi-Fi Standard | N/A | WiFi 4 | N/A | N/A | N/A |
| Width | 17 in | N/A | 17 inches | 17.2 inches | 17.3 inches |
| Wireless Support | No | Yes | No | No | No |
ADSL/POTS router with firewall and IDS. Reliable IPSEC 3DES performance keeps our office network secure.
Cisco 1801 provides stable routing and strong security. Easy to configure for small business use.
Handles daily traffic efficiently. Firewall and IPSEC keep our connections protected.
Durable and dependable router. Maintains stable connectivity and secure communications for our SOHO setup.
Reliable ADSL/Firewall solution. Cisco 1801 ensures smooth and secure office network operations.
The Cisco 1801/K9 is an integrated ADSL/POTS router designed for small offices and remote sites, featuring built-in firewall, intrusion detection, and hardware-accelerated IPsec 3DES VPN to secure and optimize WAN connectivity.
The Cisco 1801/K9 supports ADSL (ITU G.992.1), ADSL2 (G.992.3), and ADSL2+ (G.992.5) standards, ensuring broad compatibility with most service providers and flexible deployment in DSL networks.
The Cisco 1801/K9 includes a stateful firewall that monitors and filters inbound and outbound traffic based on configurable access control lists (ACLs), providing robust perimeter security for branch and small-office networks.
Built-in Cisco IOS Intrusion Detection System (IDS) inspects network traffic in real time, detects anomalies and known threats, and can trigger ACL or syslog alerts to proactively protect against intrusions.
The device provides hardware-accelerated IPsec with 3DES encryption and SHA-1 authentication, supporting secure site-to-site and remote-access VPN tunnels with up to 20 concurrent sessions.
With hardware-accelerated encryption disabled, the Cisco 1801/K9 delivers up to 8 Mbps routing throughput. With IPsec 3DES enabled, expect approximately 4–6 Mbps of VPN performance.
The Cisco 1801/K9 features two 10/100 Mbps Ethernet LAN ports, configurable as switched or separate broadcast domains, plus a single ADSL WAN interface for DSL connectivity.
Yes. The router offers Cisco IOS QoS features, including traffic classification, queuing, policing, and shaping to prioritize voice, video, and critical data over ADSL connections.
The Cisco 1801/K9 can be managed via CLI (SSH/Telnet), SNMP v2/v3, Cisco Configuration Professional (CCP), and CiscoWorks for real-time monitoring, configuration backups, and performance reporting.
Absolutely. The Cisco 1801/K9 runs Cisco IOS and supports standard routing protocols (EIGRP, OSPF, BGP), MPLS L3 VPN, and compatibility with Cisco ASA for cohesive network design.
The Cisco 1801/K9 uses a 12 VDC, 1.5 A external power adapter, consumes less than 10 W, operates in 0–40°C ambient temperature, and meets standard safety and emission certifications.
Designed for small offices, the Cisco 1801/K9 can handle up to 50 simultaneous users, combining firewall, VPN, and routing services without compromising performance.
Ideal for branch offices, retail sites, teleworkers, and small-office/home-office deployments where secure DSL connectivity, integrated firewall/IDS, and site-to-site VPN are required.
Yes. The Cisco 1801/K9 is covered under Cisco Smart Net Total Care for 24×7 hardware replacement, software updates, TAC support, and access to the Cisco online knowledge base.
Use the Cisco CLI or Configuration Professional wizard to define ISAKMP policies, IPsec transform sets with 3DES/SHA1, crypto maps, and apply them to the ADSL interface for secure tunnel setup.
Cisco offers a limited 90-day hardware warranty for the 1801/K9. Extended coverage, advanced replacement, and technical support are available via Smart Net Total Care service contracts.