the Regentry.chm file, included in the Windows 2000 and Windows XP resource Kits
is the ultimate resource for Registry information.
 

ArpCacheLife Registry Setting (Windows 2K & XP default to 120 seconds):

ArpUseEtherSNAP Registry Setting  Must be set to 1 to enable use of the Ethernet 802.2 SNAP frame format for
IP and ART traffic over Ethernet.

DefaultTTL Registry Setting    You can set the default TTL for a host using the DefaultTTL Registry setting.  You can
set the default TTL for a host using the DefaultTOS Registry setting. The entry is set in decimal for the entire TOS field

DefaultTOS Registry Setting the Registry  You can set the default TTL for a host using the DefaultTOS Registry setting.
The entry is set in decimal for the entire TOS field.

EnablePMTUDiscovery Registry Setting disable PMTUDiscovery by setting to 0

EnablePMTUBHDetect Registry Setting Defines whether the host should detect black hole routers.  A black hole router silently discards
packets without indicating the cause, thereby thwarting any auto-recovery or auto-reconfiguration attempts. Many administrators
disable ICMP responding for security reasons.

PerformRouterDiscovery Registry Setting   Setting to 0 disables the ICMP Router Discovery Process..

PerformRouterDiscovery Registry Setting   Setting to 0 disables the ICMP Router Discovery Process..

MaxUser Port Registry Setting   You can increase the supported maximum user port number by adding MaxUserPort
Registry entry.

TcpMaxConnectionRetransmissions Registry Setting   Defines the number of SYN retries sent when attempting (p229)
to establish a TCP connection.

TcpNumCorrections Registry Settings   Defines the number of TCP connections that can be open at one time (p229)

KeepAliveTime Registry Settings  Defines how long to wait before sending the first TCP keep-alive packet. (p231)

KeepAliveInterval Registry Setting   Defines the delay between keep-alive retransmissions when no acknowledgments are recieved (p232)

TcpTimedWaitDelay Registry Setting   You can control the Time Wait delay by changing this setting (p234)

TcpMaxDataRetransmissions Registry Setting (p236)

TcpInitialRTT Registry Setting  Defines the initial retransmission timeout (RTO). (p237)

GlobalMaxTcpWindowSize Registry Setting  (see, TcpWindowSize Setting) (p239)

TcpWindowSize Registry Setting  This setting, if existent, overrides the GlobalMaxTcpWindowSize Registry setting for the interface
on which it is configured. (p240) Used  to determine the amount of unacknowledged data that can go out on the wire from any sender.

TcpUseRFC1122UrgentPointer Registry Setting  Can be configured to interpret the Urgent Pointer field according to RFC1122 p244)
This setting is relevant only if  the URG pointer is set.  If the URG pointer is set, the receiver must examine this filed to see where to
 look/read first in the packet. Win 2K and XP are default configured to use the Urgent Pointer filed interpretation defined in RFC 793.
This Registry setting will change the Win2K and XP default of RFC 793 to RFC1122 settings.  (0=false or off; 1=true or on)

EnableProxy Registry Setting  Entry must be  set to 1 to configure any Win 2K or XP workstation or server to be a WINS proxy.

1. Guide to TCP/IP, second edition, Laura A Chappell, Ed. Tittel, Thompson Course Technology, 2004
 

Uniques by CatheyMc