Sometimes things go right for a change.
I finally got my dual-ISP single-hub DMVPN with mGRE, ipsec and EIGRP working. I may have to do some tuning of the failover to smooth things out, but it’s working, and that’s what’s important. I can kill the primary ISP connection and after a short delay of 20 seconds, traffic resumes flowing to my spokes over the secondary ISP connection.
The tools that go into this:
- DMVPN
- mGRE tunnels
- IPSEC
- IP SLA’s
- EEM
- EIGRP
I’m hoping to write a how-to regarding this soon.
My son tends to get addicted to things. Well, maybe not addicted, but he definitely has a one-track-mind when it comes to fun. Star Wars was all he could think about for a long time – the original movies, the LEGO Star Wars video games, the new animated series… He was even Darth Vader for Halloween. His life revolved around it. Continue reading »
I’ve been running Linux for a long time, the most recent distro being Fedora. Fedora’s been good, but I’ve cheated over the years and done the upgrades in the non-supported way, using yum. I’ve upgraded all the way from Fedora 3 to Fedora 9 without doing a clean install, and I’ve always suspected a lot of my wierd little problems were due to old junk hanging around that should have been cleared out. Continue reading »
I wrote a short article a few days ago about how much I like Perl and how useful it is. Perl is by far the language I use the most when writing CGI for web sites or writing more complex scripts for admin duties. I still use straight shell script (bash) for very simple things, but Perl for most everything else. Continue reading »
There are scads of programming languages out there. Some are designed with something specific in mind, like HTML. Others are more general, meant to be tools for many uses. Perl is one such language.
There are many people out there who love Perl because of it’s readability, it’s style, it’s “perlness”. What I think makes Perl so valuable is the vast list of modules available. You want to generate an Excel file from your data? Someone has written a module already that handles the ugly details – install the module, call methods from it, and bam, you’ve got an Excel file.
Today I needed to generate an email with a text-document attachment. I installed MIME::Lite, followed the examples, and 10 minutes later, I’ve got a section of code that will kick out an email with a text document attached to it. I don’t need to know what it’s doing in the background, just how to call it’s methods.
The place to get Perl modules is www.cpan.org. There are usually multiple modules that will accomplish the same thing, so if you don’t like the first one you find, try looking for another one.
It may be that prices on mainstream PC’s such as Dell and HP are getting so low that it’s less expensive to just buy a new machine than to do simple things like replace a failed hard drive or add more memory to support bigger apps. It’s already happened with home printers, with the prices [...]
I said before that I thought I had discovered a Cisco bug. Turns out that’s probably not the case, although I have discovered a problem and don’t have a solution – yet. Bookmark to:
I think I might have found a new Cisco bug! I found out that the current 12.4(23) Advanced IP Services image will not boot correctly on a new 3845 router. It dies with a bus error and tries again several times, only to finally end up in rommon mode because it can’t boot. I reverted [...]
Here’s a neat trick that I found. Many Cisco-savvy techs through the years have known that it’s very handy to use a 2511 as a serial terminal server. Hook up both breakout cables and you can have serial console access to up to 16 other Cisco devices. For a remote data center, this can come [...]
