OSPF is designed to give you the redundancy you want, being able to use two links for incoming or outgoing traffic. However their isp must provide both links and support ospf. This will give them the same ips on either link. If they have different isps for dialup and wireless, they either need to use bgp to host their own mail server (which is just silly) or use the method I described. By the way setting up OSPF just for this is kind of silly too. GNU Zebra will do OSPF/BGP on linux if the router does not. I still recommend fetchmail as the simplest and optimal solution.
Cory On Wed, Jan 08, 2003 at 05:15:44PM -0800, Linux Rocks ! wrote: > Bob, > Now those are questions! I can relate to the inability to phrase questions > and get help via google... it can be very frustrating getting 100000 hits on > completely irrelevent topics! > Another good resource (albeit rather frustrating at times) is IRC. > If Im understanding this correctly, you have a mailserver that connects to > the internet via wireless, and via dialup (modem). With the exception of > flaky wireless, they are both connected 24/7. When the wireless is flaky you > would rather it route mail via the dialup, but not always (likely since the > wireless is faster). > This sounds like you want some dynamic routing based on which ever route is > more fastest (ie, if wireles gets unstable, switch to dialup, if wireless > becomes more stable, switch to wireless). > I dont know if this helps, but dialup(ppp) can be set to "Dial on Demand), so > you dont maintain a constant dialup, you dialup when something access's the > internet (then eventually the isp disconnects after no activity, or you can > manually disconnect). > The issue regarding default routing can be handled with route probably, and > maybe you could (if there areent already some) write a script that checks the > connection using ping or traceroute, and makes new default routes with route. > I dont know the specifics with route, but probably you could just route > specific requests via a specific IP or net device, so anything that makes > requests to mail.blah.whatever get routed through ppp0. > > Personally, I like the dynamic approach... its much more complicated :) > > Jamie > > > > On Wednesday 08 January 2003 02:55 pm, Bob Crandell wrote: > : Hi, > : > : How do I make the default routing fall back to the modem when the wireless > : dies? Both the modem and the wireless have static IPs. Mail arrives via > : SMTP. > : > : How do I make the mail send and receive over the modem whether the wireless > : is up or down? Or if mail follows a working default route, then who cares? > : > : My inablility to phrase questions is the reason I can't find very much with > : Google. > : > : Thanks > : > : Linux Rocks ! ([EMAIL PROTECTED]) wrote*: > : >Im a bit unsure what the question here is.. I think I understand the > : > situation (well... mostly), but what is the question? > : > > : >Jamie > : > > : >On Wednesday 08 January 2003 08:21 am, Bob Crandell wrote: > : >: Hi, > : >: > : >: This is a "How do I". > : >: > : >: An office has a wireless internet connection. It is unstable. They > : >: want a dialup connection to handle mail. They can live without > : >: browsing. They can't live without email. > : >: > : >: I think what I want is to dynamically point the default route to the > : >: working connection preferring the 128k wireless connection to the 19200 > : >: modem connection. > : >: > : >: An SMC router is controlling the modem and a DLink router is controlling > : >: the wireless. > : >: > : >: If it's a script, it will be running on a Linux server checking if the > : >: wireless connection is working. > : >: > : >: Thanks > : > > : >_______________________________________________ > : >Eug-LUG mailing list > : >[EMAIL PROTECTED] > : >http://mailman.efn.org/cgi-bin/listinfo/eug-lug > > -- > No microsoft products were used to produce this message. > EUG-LUG Mailing List: > http://mailman.efn.org/cgi-bin/listinfo/eug-lug > > _______________________________________________ > Eug-LUG mailing list > [EMAIL PROTECTED] > http://mailman.efn.org/cgi-bin/listinfo/eug-lug _______________________________________________ Eug-LUG mailing list [EMAIL PROTECTED] http://mailman.efn.org/cgi-bin/listinfo/eug-lug
