A good question that can save people a lot of headache in a production environment. When you download the IOS from CCO, there's a table that lists the filename, file size, date published and a more info hyperlink (shown as a "?" character.) Click on the question mark. One of the items listed is the MD5 hash of the file as verified at Cisco. After downloading the IOS, run the md5 hash algorithm locally. The results should match. Otherwise, download the IOS again... You can find source code/executable binaries that calculate md5 on the net. Although more commonly used on unix systems, there are win32 implementations. All in all, about a 60 kB download gives you peace of mind, before the upgrade. Here's the version of md5 for win32 that I use: http://weblink.filegenie.com/?MEMBERID=73&FILENAME=md5.zip ----- Original Message ----- From: "Hugo" <[EMAIL PROTECTED]> Newsgroups: groupstudy.cisco To: <[EMAIL PROTECTED]> Sent: Saturday, November 11, 2000 11:22 AM Subject: Cisco IOS flash image checksum verification > Hi, does anybody know whether there is a way to check the integrity of Cisco > IOS images (on my PC's disk) before trying to load them into a router? > > Alternatively if someone could tell me or give me a reference to the > algorithm I'll write a program to do it and make it available. > > Thanks > -- > Hugo > [EMAIL PROTECTED] > > > _________________________________ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
