Using dual NICs for different LANs

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hello,

i have windows server 2008 r2 sp1 vm using vmware.  i using server host network scanning tool find vulnerabilites on other machines on network.  my question is, there downside using dual nics give me ability scan 2 different lans?  the os gives warning... 

"warning - multiple default gateways are intended to provide redundancy to single network (such intranet or internet).  they not function when gateways on two separate, disjoint networks (such 1 on intranet , 1 on internet).  do want save configuration?"

i wanted know standard practice or if there major issues in doing this.  the program using (retina) seems fine utilizing 2 nics scan different lans.  of course alternative build different vm each network.

thanks help,

-linedrop

you can use dual nics connecting computer different vlans, however, having default gateway configured on both interfaces, doesn't make lot of sense, networking perspective.  second nic connecting single segment (no other routers on subnet)?  if so, again, there no need default gateway nic.

the default gateway used computer figure out send packet if destination address or route segment not listed in local routing table of computer.

if there multiple routers (gateways) available for computer has more 1 nic, use route command tell computer interface want packets leave from.  bit hard explain without having more information network layout.

maybe these resources can understand:

how ip packets routed on local area network
http://www.anitkb.com/2010/06/how-ip-packets-are-routed-on-local-area.html

using windows route command
http://www.anitkb.com/2010/03/using-windows-route-command.html

 

visit: anitkb.com, knowledge base.


Windows Server  >  Network Infrastructure Servers



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