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NACK vs. ACK? When to use one over the other one? The reason for the ACK is that a NACK is simply not sufficient Let's say I send you a data stream of X segments (let's say 10 for simplicity) You are on a bad connection, and only receive segments 1, 2, 4, and 5 Your computer sends the NACK for segment 3, but doesn't realize there should be segments 6-10 and does not NACK those
Fast retransmit: NACK OR ACK? - Network Engineering Stack Exchange Fast retransmit, as well as as ACK NACK as details of your specific network protocol Therefore you could in principle combine them as you wish Nevertheless some combinations make more sense than others and some parts are required if you use others (e g having more than one packet in flight between sender and receiver will force you to use
Why do I see a RST, ACK packet instead of a RST packet? A RST ACK is not an acknowledgement of a RST, same as a SYN ACK is not exactly an acknowledgment of a SYN TCP establishment actually is a four-way process: Initiating host sends a SYN to the receiving host, which sends an ACK for that SYN
DHCP - General relativity - Network Engineering Stack Exchange Not sure about general relativity, but yes, the DHCP server is the "source of truth" When a client reconnects to a network it was previously attached to, it may include the Requested IP Address field, offering a hint to the server that it would prefer it's old IP address back, however it may no longer be available (either due to the server leasing it back out to another client, or a client
Is a DHCP offer packet a broadcast or unicast? Be aware of the broadcast flag, see RFC2131 (page 24): A client that cannot receive unicast IP datagrams until its protocol software has been configured with an IP address SHOULD set the BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or DHCPREQUEST messages that client sends
Why does a Bluetooth header have both ACK and FLOW? Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
how to capture DHCP packets in wireshark Hy! I want to capture DHCP packets in Wireshark but I did not receive any Not my filter wrong, I don't get any So I think I can't trigger the DHCP communications my filters: dhcp bootp udp port
Why only after 3-duplicate ACK retransmission takes place in TCP? You're referring to 'Fast Retransmit' in the TCP Reno implementation It is basically an assumption RFC 2001, TCP Slow Start, Congestion Avoidance, Fast Retransmit, and Fast Recovery Algorithms covers this:
Why is ARQ (Automatic Repeat reQuest) named so? I can't make sense of a naming for Automatic Repeat reQuest The idea is that ARQ is a method for transmitting data without negative ACKs, so standard ARQ flow is: Sender sends a packet If sender