• The Cisco PIX 501 50-user license supports up to 50 concurrent source IP addresses from your internal network to traverse through the Cisco PIX 501. The integrated DHCP server supports up to 128 DHCP leases. As your needs grow, a 50-to-unlimited user upgrade license is also available, allowing you to further extend your investment in Cisco PIX 501 equipment. • The Cisco PIX 501 Security Appliance has two optional encryption licenses-one license (PIX-501-VPN-3DES) enables 168-bit 3DES and up to 256-bit AES encryption, the other license (PIX-VPN-DES) enables 56 -bit DES encryption. Both are available either at the time of ordering the Cisco PIX 501 Security Appliance, or can be obtained subsequently through Cisco.com. Note that an encryption license must be installed to activate encrypti.
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