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To: Greg from Edmonton who wrote (11527)	11/22/2000 12:59:02 AM
From: Howard R. Hansen	Read Replies (1) of 14778

Linux-based internet solution which offers: - high-availability, will automatically route to the other internet connection if one fails Maybe you know something Joel doesn't know but the following article says that building a LINUX system that can automatically switch between a DSL and a cable modem connection when one or the other modem fails is not a trivial task. The following article was written by Joel Kiepplinger with earthweb. Publication date 11-1-00. Good luck with your endeavors. "I've been in the process of designing a Windows 2000 Server/Pro network with dual Internet connectivity -- DSL and Cable. The theory is that I can set up a Linux box as a router that will forward the Internet connection to the Win2k server, which will in turn pass it on to its DHCP clients. The Linux box would be connected with both DSL and cable Internet options, the first being primary and the latter being a backup. My solution would involve 3 NICs in the Linux box with every network connection being live and the routing tables being the only means of controlling through which interface the Net connections would flow. The challenges to this design would be making the transition from one ISP to the other simply done on the server and transparent to the end users. My current solution is to create a shell script that switches the default route from one interface to the other (and using the appropriate gateway). While being quite workable, it requires that the person doing the switchover be able to log into the machine as a superuser, something restricted to myself alone. I'd prefer a solution that would allow a couple other trusted individuals to have JUST this power and no others, but I haven't yet discovered it. The other major stumbling block is handling where SMTP points to when sending mail. Without a mail server on the Linux box (or perhaps the Win2k box), each client would have to manually reconfigure their SMTP server settings every time the ISP switch took place, destroying all pretense of end user transparency. I'd prefer not to run sendmail on the Linux machine simply due to the fact that the box is designed to be a firewall and sendmail has a long history of security exploits. MS Exchange is really not an option because of the high pricing. I'm not aware of any low-cost or free email server solutions for Win2k yet, although I've admittedly been lax on my searching. So what do you think? What are the solutions you would use or consider? Discuss your thinking on the SysOpt Forum or drop me an email. sysopt.earthweb.com "

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