configure Linux so that if it can not access web pages over one nic to use other nic

[Jim B]

What is the best to have 2 internet connectinons to one linux box on 2 
different ethernet interfaces and if the web can not be accessed over one 
nic for Linux to then use the other nic for Internet access?
 Basically nic A is for intrnal network and to access the Internet
nic B is only to access the internet which should be used for Internet 
access as the primary.
 Basically I would like to configure the Linux box to have redundant 
Internet access.
  Jim
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