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  • How can I determine the size of a packet?

    I have initiated a TCP connection for a HTTP request and response. Now after it was completed, I sent a request to the server for the HTTP packet (with a SYN flag set). The server responded with a ACK flag but when that finished, it sent a FIN flag. So my question is: How can I figure out the size...

    ITKE350,845 pointsBadges:
  • Does a TCP send a SYN/ACK on every packet?

    I currently have a TCP server that always listens for an incoming client, then it sends one packet of data every single second. Bur I have a quick question: Does a SYN/ACK packet only get sent on initial connections, like this: SYN ACK DATA DATA DATA Or is it sent with every packet, like this: SYN...

    ITKE350,845 pointsBadges:
  • How to find packet sent address

    I need to create an automated response so that when I receive a UDP packet for a sender, that sender receives the address it was sent from. I tried using the recvform, but that only brings up the address of the sender, not the the address from which the packet was sent.

    ITKE350,845 pointsBadges:
  • Sending UDP packets to a different subnet

    Can UDP broadcast packets be sent to a different subnet through a router? I’m curious because I need to find certain devices on the network, and some of them may be on different subnets.

    ITKE350,845 pointsBadges:
  • A host receives an authenticated packet with the sequence number of 181

    A host receives an authenticated packet with the sequence number of 181 and the replay window spans from 200 to 299. What will the host do with this packet?

    Securenetwork5 pointsBadges:
  • Speed benifits of MPLS and reasons

    We have just finished migrating over to our parent companies domain. We are now on their exchange and are updating and moving domain data back and forth. We are upgrading to a 50/10mps cable line but are getting some pressure to spend about 12000 dollars per year for a MPLS line. What are the...

    swinehart68031,050 pointsBadges:
  • How to send packets in peer-to-peer networking

    hello.. i'm still new in IT field.. i want to ask some question about networking.. how do i want to send tcp and udp packet in peer to peer network environment which is without any server in my topology. i don't know what software should i use. after send both packet, i have to capture the packets.

    Skh35 pointsBadges:
  • Inbound traffic is coming from router IP, not internet IP. Why?

    Hello, thank you for your time. I have recently noticed a strange occurence going on with inbound traffic. The other day, I helped my friend set up his network. icmp ping was good. while sniffing, I first noticed inbound tcp traffic to me was not coming from my friend's IP address, but coming from...

    Robert5795 pointsBadges:
  • Packet loss in a Cisco 3750 stack

    I am seeing occasional packet loss in a Cisco 3750 switch stack. There are 5 switches in the stack. The client is on switch 5 and the server is on switch 4. The client is on a separate vlan from the server. I am not seeing any errors on the ports or VLANS or NIC's. Where should I be looking to find...

    Labnuke9932,960 pointsBadges:
  • Electromagnetic Interference on CAT5E

    What is the highest level of EMF that a CAT5E can handle before you see start seeing problems with packet

    Data17045 pointsBadges:
  • Scanning network packets on Windows server 2003

    We need to capture network packets for analysis on our Windows server 2003. How can we achieve this and is there a guide to analyzing this data?

    TeachMeIT975 pointsBadges:
  • Wireshark/Ethereal Retransmission

    Can anyone explain the mechanisms for retransmission and fast retransmission in wireshark/ethereal?

    Tbolitho10 pointsBadges:
  • when receiver send ACK for multiple packets?

    I studied tcp sliding window. From there, sender can send several packets without receive ACK from sender based on window size. But in captured packet, receiver send ACK after received two or three packets from server. Why it works like this? window size is enough to get more packets.

    ITKE350,845 pointsBadges:
  • Ethereal

    can we captured packets from a network having host working on different platform ?

    Chirag8885 pointsBadges:
  • What if packet size cannot be represented as a value divisible by 8?

    Suppose a packet contains 23 bytes of data, and the MTU of the network is 1024 bytes. We have to make sure the data is divisible by 8. But in this case, that is not possible since if the data is represented as 24 bytes,there will be an extra byte (where do we get it from?) and if the data is...

    Somanyquestions5 pointsBadges:
  • Obfuscation of destination IP address

    A self proclaimed security architect told me that there were hacking attacks where the hacker "obfuscated" the destination IP address to confuse the router into forwarding the packet out all of its interfaces and subsiquently the packet would live forever. In my limited knowledge I was a bit...

    Below1110 pointsBadges:
  • Java method to reset a packets time to live

    I was told that there is a JAVA method to reset a packets time to live. Given that a packet being accepted by a machine that had java on it would create a new header anyway, is the point to increase the TTL? The person made the statement that these packets roam the Internet for years. am I missing...

    Below1110 pointsBadges:
  • Coding for packet header duplication

    I want to know, how to filter packet header duplication. Packets may travel in sequentially over the internet. If the headers duplicate, the traffic will delay. so, I want to block the site that header duplicated. It may be Perl, C++ or other programming languages.

    Yupar10 pointsBadges:
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