How to configure ppp as a backup when cable modem fails.

How to configure ppp as a backup when cable modem fails.

Post by Alex » Tue, 29 Jan 2002 12:32:48



Is there any way to run some kind of a script that would automatically
switch to ppp when cable modem(eth1) fails. I am getting ready for Comcast
switchover to its own network. Thanks
 
 
 

How to configure ppp as a backup when cable modem fails.

Post by Dean Thompso » Thu, 31 Jan 2002 00:30:32


Hi!,

Quote:> Is there any way to run some kind of a script that would automatically
> switch to ppp when cable modem(eth1) fails. I am getting ready for Comcast
> switchover to its own network. Thanks

Yes, but you will normally have to write a script which handles the transfer.
Basically just write a script which tries to reach the other side of your
gateway using the eth1 interface.  If the link fails, you can drop the default
route and then start a PPP session to get your box up and running.

See ya

Dean Thompson

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1. Cable modem..56 modem dial up, 500K cable modem download stream...

I have 2 network cards and 1 modem in a Linux Box with RH6.
My cable modem uses the modem to start a PPP session, and the network card
is then hooked up to the VPN of the ISP.

I would like to setup a IP Masquraded Firewall to hook some of my other
boxes
behind the firewall.

I  cannot find a HOW-TO to setup the Linux box using this type of Cable
Modem.  I
have only found 2 way cable modems.  Can someone point me it the right
direction.

My problem is that I don't know how to get Linux connected, then also, how
do I configure
ipchains or ipfwadm to use the correct rule set.  Do I do the modem or the
network card.  The
network card has a static IP of 10.0.0.1 which is usally used for VPNs.  My
cable company
is of corse not supporting Linux, so I have to do it myself.  The PPP dialup
uses DHCP to
assign my address so I have dhcp setup.

Thanks in advance..

Aaron

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