How can I verify the integrity of a WAN connection?

Posted by Nic Waller on Server Fault See other posts from Server Fault or by Nic Waller
Published on 2010-03-10T19:53:41Z Indexed on 2010/03/11 4:41 UTC
Read the original article Hit count: 311

Filed under:

tcpip

|

checksum

|

wan

We have two scanners in our branch office which upload images to the head office via FTP. In the last week, both scanners have started delivering a lot of corrupted images.

I suspect that the problem may be with the WAN link, and that TCP might not be detecting/correcting all errors. Is there any software for Windows that allows me to test the integrity of the connection by sending packets with an embedded CRC?

© Server Fault or respective owner

Related posts about tcpip

Need help diagnosting a random BSOD

as seen on Super User - Search for 'Super User'
I have random BSOD even in idle .. Already tried: memtest - ok scandisk- ok netsh int ip reset Winsock fix. tcpip.sys+2c13e 21.06.2011 15:21:00 DRIVER_IRQL_NOT_LESS_OR_EQUAL tcpip.sys+2de08 22.06.2011 15:09:28 DRIVER_IRQL_NOT_LESS_OR_EQUAL tcpip.sys+2de08 22.06.2011 16:09:31… >>> More
iPhone/iPod receive messages from C# tcpip server using CocoaAsyncSocket

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, i'm trying to send/receive data over wifi to an iphone/ipodtouch app from a C# tcpip server. for this i used cocoaAsyncSocket from the google project. If i push a button and i send a request from ipod to server it returns the requested data(song title for example)..i want to know every second… >>> More
Socket(TCPIP) Unstable

as seen on Server Fault - Search for 'Server Fault'
I have a setup of a SCPI server in a Win7 PC and have 2 other programs talking to it locally(127.0.0.1) over TCPIP socket 5025 and 5029. This worked well and stable in a fresh PC, but when we moved it into our production lines and the IT dept added their policies and stuff, it became unstable. The… >>> More
xt_TCPMSS: bad length messages

as seen on Server Fault - Search for 'Server Fault'
I'm getting loads of messages like: Jun 23 10:24:20 awakening kernel: [ 1691.596823] xt_TCPMSS: bad length (1492 bytes) Jun 23 10:24:21 awakening kernel: [ 1692.663362] xt_TCPMSS: bad length (1448 bytes) Jun 23 10:24:21 awakening kernel: [ 1692.663495] xt_TCPMSS: bad length (1448 bytes) Jun 23 10:24:21… >>> More
What is "Disable class based route addition" good for?

as seen on Super User - Search for 'Super User'
In the advanced TCP/IP settings of a VPN connection, i found a checkbox labeled with "Disable class based route addition". The checkbox is only enabled as long as "Use default gateway on remote network" is switched off. What is "Disable class based route addition" good for? Detailed instructions… >>> More

Related posts about checksum

Recommend software: File checksum calculator

as seen on Super User - Search for 'Super User'
Hi, I'm looking for a light, fast hash/checksum calculator (eg. MD5, SHA1, etc.). I've been using HashCalc and it works fine enough, but I was wondering if there was something better. When downloading .ISOs from MS BizSpark, I've found that it's essential to check the SHA1, and I'm sure that other… >>> More
tcp checksum and tcp offloading

as seen on Stack Overflow - Search for 'Stack Overflow'
i am using raw sockets to create my own socket. i need to set the tcp_checksum. i have tried a lot of references but all are not working (i am using wireshark for testing). could you help me please. by the way, i read somewhere that if you set tcp_checksum=0. then the hardware will calculate the checksum… >>> More
What is the fastest way to create a checksum for large files in C#

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have to sync large files across some machines. The files can be up to 6GB in size. The sync will be done manually every few weeks. I cant take the filename into consideration because they can change anytime. My plan is to create checksums on the destination PC and on the source PC and than… >>> More
TCP RST Reset Every 5 Minutes on Windows 2003 sp2

as seen on Server Fault - Search for 'Server Fault'
Hey, Recently I had a web developer come to me and ask why he was receiving connection errors in his app that was accessing a sql database. So, I went through my normal trouble shooting steps to isolate or reproduce the issue. I discovered that if I connected to the database using Query Analyzer… >>> More
TimeStamp and mini-ETL (extract, transform, load)

as seen on SQL Blogcasts - Search for 'SQL Blogcasts'
Short example how to use Timestamp for a mini ETL process of your data. example below is following: Table_1 is production table on server1 Table_2 is datawarehouse table on server2 where datawarehouse is located Every day data are extracted, transformed and loaded to dataware house for further off-line… >>> More