APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

SCO Unix TCP/IP and NFS FAQ

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

TCP/IP gives messages like "Notice: TCP SUM: SRC 89270107 SUM 0000D7AD" (Old Sco Unix)

This simply means that TCP detected a checksum error in a packet. TCP is a reliable protocol and will automatically request that the packet be re-sent. This message serves as a notice only and should not be of concern unless it occurs frequently. If you wish to determine the IP address of the machine that sent the bad packet, convert the SRC field from hexadecimal (89.27.01.07) to decimal (137.39.1.7). There are two common causes for these on high-speed networks, which are flaky network cards and slow cards that can't keep up with network traffic. Also, these messages are common on SLIP and PPP links.

Under Unix, at least, you may be able to stop the system from printing these errors. In /etc/conf/pack.d/tcp/space.c, find the line which reads int tcpprintfs = 1; and change the 1 to a 0. Relink the kernel and reboot. I don't know of any similar procedure under Xenix ...

In OpenServer Release 5, this variable defaults to zero (i.e. not printing these diagnostics). It can be adjusted without a reboot using inconfig.

Got something to add? Send me email.





(OLDER)    <- More Stuff -> (NEWER)    (NEWEST)   

Printer Friendly Version

->
-> (SCO Unix) TCP/IP gives messages like 'Notice: TCP SUM: SRC89270107




Printer Friendly Version

Have you tried Searching this site?

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us


Printer Friendly Version





Perl is designed to give you several ways to do anything, so consider picking the most readable one. (Larry Wall)




FAQ

Networking

SCO_OSR5



Unix/Linux Consultants

Skills Tests

Unix/Linux Book Reviews

My Unix/Linux Troubleshooting Book

This site runs on Linode


SCO Unix Sales, Support, & Service

Phone:  707-SCO-UNIX (707-726-8649Toll Free: 833-SCO-UNIX (833-726-8649)
www.SCOsales.com