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PPTP inherits the use of MPPE encryption from PPP (MPPE is also used for dial-up remote access or demand-dial connections), which uses the Rivest-Shamir-Adleman (RSA) RC4 stream cipher. MPPE is only available when either the EAP-TLS, MSCHAP, or MS-CHAP v2 authentication protocols are used. MPPE can use 40-bit, 56-bit, or 128-bit encryption keys. The 40-bit key provides backward compatibility with clients running Windows 98 or Windows Millennium Edition. By default, the highest key strength supported by the VPN client and VPN server is negotiated during the connection establishment process. If the VPN server requires a higher key strength than is supported by the VPN client, the connection attempt is rejected. MPPE was originally designed for encryption across a point-to-point link, in which packets arrive in the same order in which they were sent with little packet loss. For this environment, the decryption of each packet depends on the decryption of the previous packet. For VPNs, however, IP datagrams sent across the Internet can arrive in a different order from the one in which they were sent, and a higher proportion of packets can be lost. Therefore, MPPE for VPN connections changes the encryption key for each packet. The decryption of each packet is independent of the previous packet. MPPE includes a sequence number in the MPPE header. If packets are lost or arrive out of order, the encryption keys are changed relative to the sequence number.

IP: Total Length = 328 (0x148)

A hazard distinct to this case is that the two loops have to be maintained in parallel. If count changes to clientCount, you have to remember to change it in both places, which is an annoyance for you and a maintenance headache for anyone else who has to work with the code. This example also illustrates a key challenge in code tuning the effect of any specific code tuning is not predictable. The code tuning produced significant improvements in three of the four languages, but not in Visual Basic. To perform this specific optimization in this specific version of VB would produce less maintainable code without any offsetting gain in performance. The general

IP: Identification = 15408 (0x3C30)

IP: Flags Summary = 0 (0x0) IP: .......0 = Last fragment in datagram IP: ......0. = May fragment datagram if necessary IP: Fragment Offset = 0 (0x0) bytes

lesson is that you must measure the effect of each specific optimization to be sure of its effect no exceptions.

Encryption is determined by the establishment of the Quick Mode or IPSec SA. The available encryption algorithms include the following:

IP: Time to Live = 128 (0x80)

Jamming, or fusion, is the result of combining two loops that operate on the same set of elements. The gain lies in cutting the loop overhead from two loops to one. Here s a candidate for loop jamming:

IP: Data: Number of data bytes remaining = 308 (0x0134)

DHCP: Offer (xid=21274A1D) DHCP: Op Code (op) = 2 (0x2) DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet DHCP: Hardware Address Length (hlen) = 6 (0x6) DHCP: Hops (hops) = 0 (0x0) DHCP: Transaction ID (xid) = 556223005 (0x21274A1D) DHCP: Seconds (secs) = 0 (0x0) DHCP: Flags (flags) = 0 (0x0) DHCP: 0............... = No Broadcast DHCP: Client IP Address (ciaddr) = 0.0.0.0 DHCP: Your IP Address (yiaddr) = 10.54.50.5 DHCP: Server IP Address (siaddr) = 0.0.0.0 DHCP: Relay IP Address (giaddr) = 0.0.0.0 DHCP: Client Ethernet Address (chaddr) = 08002B2ED85E DHCP: Server Host Name (sname) = <Blank> DHCP: Boot File Name (file) = <Blank> DHCP: Magic Cookie = [OK] DHCP: Option Field (options) DHCP: DHCP Message Type = DHCP Offer

Data Encryption Standard (DES) with a 56-bit key Triple DES (3DES), which uses three 56-bit keys and is designed for highsecurity environments Because IPSec was designed for IP internetworks where packets could be lost and arrive out of order, each IPSec packet is decrypted independent of other IPSec packets. The initial encryption keys are derived from the IPSec main mode authentication process. For DES-encrypted connections, new encryption keys are generated after every 5 minutes or 250 megabytes of data transferred. For 3DES-encrypted connec-

For i = 0 to employeeCount - 1 employeeName( i ) = "" Next ... For i = 0 to employeeCount - 1 employeeEarnings( i ) = 0 Next

DHCP: Renewal Time Value (T1) = 8 Days, 0:00:00

DHCP: Rebinding Time Value (T2) = 14 Days, 0:00:00