tcp

  1. S

    How to extract the TCP header of Incoming and Outgoing Packets using sk_buff? How can we create an LKM for the same?

    I want to extract the TCP header and print the Header details of both incoming as well as outgoing packets but I need to hook that module in the Linux Kernel. That is I need to create an LKM for the same.
  2. D

    Question related to TCP/IP buffering in linux

    I have been trying very hard to find about buffers used in TCP/IP as part of packet transfer in linux. More i read, more i get confused. Below given are questions i have. Can someone help me figure it out? 1)Is the driver queue which is implemented as a ring buffer with descriptors pointing to...
  3. L

    TCP performance for OpenVPN vs delay

    I have got some issue in TCP performance depended on delay. My lab schema: CPE --- (p1) Router (p2) --- Server The CPE connects to the Server by OpenVPN using TCP. I know about TCP-over-TCP but TCP proto is mandatory! Next I do series of network benchmarks through the OpenVPN tunnel. Series...
  4. J

    Router only supports IPv6 port forward but users need IPv4

    Hello there, I currently have a TCP-Server on my local machine. I got an IPv4 and an IPv6 address on this Machine. But my Router only supports IPv6 Port forwarding. I tried that but 99% of the users couldnt connect because they only got IPv4 and the Server is IPv6. I tried "serveo" and "ngrok"...
  5. N

    Open TCP session

    I am getting the relatively high number of open TCP session, can anyone please help me understand how can I increase the limit and is it safe to increase it, depending on server resources. Total: 1079 (kernel 1593) TCP: 40140 (estab 283, closed 39387, orphaned 0, synrecv 0, timewait...
  6. J

    RST hijacking correct ack number

    For learning purpose, I'm trying to RST hijack my current session : 22:29:20.185032 IP 172.10.10.11.43086 > 172.10.10.21.http: Flags [ S ], seq 2173271328, win 29200, options [mss 1460,sackOK,TS val 3615590 ecr 0,nop,wscale 7], length 0 22:29:20.185090 IP 172.10.10.21.http > 172.10.10.11.43086...
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