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英文字典中文字典相关资料:


  • Network port number; why 16-bit has 65535, not 65536?
    The port number is a representation of bit in base 2 2 power of 16 equal to 65536: It is the amount of numbers in base 2 that can be created with 16 bits, the number 65536 does not represent the last number that can be created in base 2 with 16 bits In base 2, first number is 0000,0000,0000,0000 , in base 10 is 0
  • How is 65535 bytes is total length of IP datagram?
    The maximum size of an IPv4 packet is 65,535 because the Total Length field is a 16-bit unsigned integer, which has a possible 65,536 values (from 0 to 65,535) This created 2 confusions for me Say we have 1 bit number Then there are 2 possible values 0 and 1 Say, each value occupies 1 byte in memory
  • Is a TCP server limited to 65535 clients?
    A TCP Port field is 2x bytes and holds a quantity of 65536 This number limits the amount of addresses a server can have But this doesn't limit the number of clients to ~64k Each TCP Packet has two Port fields one for the destination and one for the source (as well as two IP addresses)
  • Sonicwall NAT pooling PAT SNAT state table exhaustion
    There is a maximum of 65536 ports per address, and two ports are used per state, so 65536 2 = 32768, with separate tables for each protocol of TCP, UDP, and ICMP Networks with a sufficiently large number of users can start experiencing random state exhaustion events during periods of high load
  • Why BGP max message size is choosen as 4096 ? why not 2^16?
    65536 4096 = 16 Do we really want BGP's transient RAM requirements to multiply by 16? Remember that under the covers, many BGP implementations are written in C, which means BGP could need to malloc space for every message to the maximum message size Obligatory rhetorical questions Why do we have any variable size limits in software?
  • range of AS numbers which are given out by RIRs
    0 - reserved ASN 23456 - AS_TRANS 64496 - 64511 - reserved for documentation 64512 - 65534 - private ASN 65535 - reserved ASN 65536 - 65551 - reserved for documentation 4200000000 - 4294967294 - private ASN 4294967295 - reserved ASN
  • IPv4 maximum datagram size - Network Engineering Stack Exchange
    The maximum size of an IPv4 packet is 65,535 because the Total Length field is a 16-bit unsigned integer, which has a possible 65,536 values (from 0 to 65,535) The maximum payload is 65,515 only if the header is 20 If the header is 60, then you must subtract 40 from that because the total packet size cannot exceed 65,535
  • Purpose of the Transport Layer from a Conceptual Perspective
    For example, TCP and UDP have up to 65536 addresses (ports) each, to which processes may attach Other layer-4 protocols can allow more, or less, processes to attach You can also have different layer-4 protocols, which serve different purposes, (e g connection-oriented, connectionless, custom for a specific purpose, etc )
  • TAC Response on the error( %SYS-2-MALLOCFAIL: Memory allocation)
    The most common reason I've seen for alloc failures has been serious misconfiguration of the default route -- ip route 0 0 0 0 0 0 0 0 f0 0 will cause this because it's proxy-arp, and the ARP table will grow to an insane size
  • Does the NAT source UDP port depend only on src ip port?
    Does it depend on the dst ip port as well? If not, does it mean one PC, even one src port in Network A, can use up all the NAT hash table entries in Network B? (I hope it takes at least 65536 Network A src ports to fill up the NAT hash table entries in Network B ) BTW: This question was moved from Stack Overflow, as I think it fits here better





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