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 OSX
tc-csum
Checksum action in tc(8) Linux Checksum action in tc(8)NAME
csum - checksum update action
SYNOPSIS
tc ... action csum UPDATE
UPDATE := TARGET [ UPDATE ]
TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | SWEETS }
SWEETS := { and | or | + }
DESCRIPTION
The csum action triggers checksum recalculation of specified packet headers. It is commonly used to fix incorrect checksums after the pedit
action has modified the packet content.
OPTIONS
TARGET Specify which headers to update: IPv4 header (ip4h), ICMP header (icmp), IGMP header (igmp), TCP header (tcp), UDP header (udp),
UDPLite header (udplite) or SCTP header (sctp).
SWEETS These are merely syntactic sugar and ignored internally.
EXAMPLES
The following performs stateless NAT for incoming packets from 192.0.2.100 to new destination 198.51.100.1. Assuming these are UDP packets,
both IP and UDP checksums have to be recalculated:
# tc qdisc add dev eth0 ingress handle ffff:
# tc filter add dev eth0 prio 1 protocol ip parent ffff:
u32 match ip src 192.0.2.100/32 flowid :1
action pedit munge ip dst set 198.51.100.1 pipe
csum ip and udp
SEE ALSO tc(8), tc-pedit(8)iproute2 11 Jan 2015 Checksum action in tc(8)