![]() There are plenty of third party application that can be installed, some of which add checksums to file properties, and some which are standalone applications. Windows, last time I checked, has no built-in tools to calculate an md5 or sha1 checksum. I’m not aware of a built-in graphical way to view checksums on a Mac, but OSX has an easy md5 command in the default shell There’s no sha1 command equivalent, but thankfully openssl-which is a deceptively feature-rich toolkit-can do both, and is installed by default on OSX: osx_bash-3.2$ md5 n6000-uk9.7.1.4.N1.1.bin ![]() The tools to validate a checksum vary depending on the platform, but here are the most common ways: File Checksum on OSX (aka MacOS) Download image file from Cisco’s website.I try to validate after each time I transfer a file so that I don’t waste time sending a corrupted file on to the next hop. Vendors tend to publish the MD5 or SHA1 checksums (or both) for downloadable files, so it’s silly not to do checksum validation and confirm that the file has downloaded completely and uncorrupted. There are various ways to check md5/sha1 checksums depending on your preferred platform. Here’s a quick reference guide to creating file checksums on Macos (OSX), Windows and Linux. While most modern systems are smart enough to validate images before attempting an installation, not all are so wise, and I’m sure I’m not the only one to have seen a device bricked (or stuck in ROMMON or a similar bootloader or equivalent) after a bad image was uploaded. ![]() It’s always a good idea to calculate an MD5 or SHA1 file checksum to validate file integrity after download or transfer, especially when dealing with firmware binaries.
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