I am communicating with two devices using my computer over UDP protocol. The application is running fine. When I monitored the UDP traffic using Wireshark software, I found that there were too many Checksum errors.
Please find attached the png file showing this error. I am about to deliver the solution to the customer and have full confidence that the communication is ok. I have however little knowledge in the field of networking.
Any comments on these checksum errors will help me put a strong technical report to the customer.
Does anyone know the answer to this?
When I run "sum -r" on a file that I've down loaded from the sco website, the 1st set of numbers differs from the checksum on the download page but the
2nd set matches.
If I try to install the patch, I get errors.
Anyone has an answer? (3 Replies)
Dear All
I have written a client server program for file transmission from one system to other using UDP.
Can i use the cksum number in the udp header to validate if the received packet is corrupted or not? If yes, how can i extract the header and validate it..
Also is there any way that... (3 Replies)
Anyone can tell me the different between "cksum" and "sum" command on Solaris? I read the man pages but still not get it.
And how to display the md5 checksum for a file.
Thanks, (1 Reply)
I wanted a script that can give the checksum of a particular zipped file.
Can somebody help me in writing a shell script in getting the checksum of a particular tar file. (1 Reply)
Hello sir,,
i m doing network programming in C
could u plzz let me know...at the time of udp checksum calculation does htons() or ntohs() play some role..??
i mean will there be any difference if some values are added in network form and other is in the host form...
Thnx 4 ur time..
... (4 Replies)
Hi All,
I installed Ubuntu10.04LTS after using it for some day , a problem started ,at system boot time error is coming
Bad BIOS checksum.Starting BIOS recovery.
checking for floppy.checking for CD is coming repeatedly but system is not cuming up.
After sometime output was also not... (0 Replies)
I'm on SCO 5.07. Just installed mini tape. Getting CMOS/GPNV checksum error when I turn on the machine and have to go into bios. I just hit f10 and I continue. When loading SCO and it get to the mini tape I get Warning: SCSI boot options ignored: Bad paremeter count. It's a QIC 80.
When in bios if... (2 Replies)
Hi ALL,
I use solaris OS and SFTP to get/put files from remote server.I use the below command ,
sftp user@host<<EOF
cd "dir"
get --checksum "filename"
EOF
I am getting a strange error as " get --checksum INVALID paramter". It has been working succesfully since last 3 years but all of a... (1 Reply)
Hi Guys,
Sometimes, I have a problem with transferred files in ftp session. Thats why I want to produce checksum value in my local server and remote server. But I could not find anyway to produce checksum value of transferred files in remote server.
Do you have any idea?
Thanks,
Emre (3 Replies)
Hello good people,
I came across md5 checksum. Can anyone please explain to me what it does and if possible an example of how to use it?
Thank you very much (1 Reply)
Discussion started by: cjashu
1 Replies
LEARN ABOUT FREEBSD
udplite
UDPLITE(4) BSD Kernel Interfaces Manual UDPLITE(4)NAME
udplite -- Lightweight User Datagram Protocol
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/udplite.h>
int
socket(AF_INET, SOCK_DGRAM, IPPROTO_UDPLITE);
DESCRIPTION
The UDP-Lite protocol provides a partial checksum which allows corrupted packets to be transmitted to the receiving application. This has
advantages for some types of multimedia transport that may be able to make use of slightly damaged datagrams, rather than having them dis-
carded by lower-layer protocols.
UDP-Lite supports a number of socket options which can be set with setsockopt(2) and tested with getsockopt(2):
UDPLITE_SEND_CSCOV This option sets the sender checksum coverage. A value of zero indicates that all sent packets will have full checksum
coverage. A value of 8 to 65535 limits the checksum coverage of all sent packets to the value given.
UDPLITE_RECV_CSCOV This option is the receiver-side analogue. A value of zero instructs the kernel to drop all received packets not having
full checksum coverage. A value of 8 to 65535 instructs the kernel to drop all received packets with a partial checksum
coverage smaller than the value specified.
ERRORS
A socket operation may fail with one of the following errors returned:
[EISCONN] when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the desti-
nation address specified and the socket is already connected;
[ENOTCONN] when trying to send a datagram, but no destination address is specified, and the socket has not been connected;
[ENOBUFS] when the system runs out of memory for an internal data structure;
[EADDRINUSE] when an attempt is made to create a socket with a port which has already been allocated;
[EADDRNOTAVAIL] when an attempt is made to create a socket with a network address for which no network interface exists.
SEE ALSO getsockopt(2), recv(2), send(2), socket(2)BSD October 1, 2014 BSD