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BSD to Cisco ASA

Hello I am a student and DIY guy. I am in the middle of configuring Cisco ASA (remotely to my school as a project), I have to configure it according to BSD configuration but I have never seen that in real life. Google is not helping me with that.

I have these interfaces:

[CODE]gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280

          tunnel inet aaa.aaaa.aaa.aaa --> bbb.bbb.bbb.bbb

          inet ccc.ccc.ccc.ccc --> ddd.ddd.ddd.ddd netmask 0xffffff00

         options=1<ACCEPT_REV_ETHIP_VER>

tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500

           inet x.x.x.x --> y.y.y.y netmask 0xffffffff

         Opened by PID 14987

[/CODE]

I have found on Googlu tha gif interface is ip tunnel, but tun interface is what according that? How is possible to configure those interfaces in Cisco ASA?

Last thing I don´t understand is a logic in those NAT commands:

[CODE]map xl3 from aaa.aaa.aaa.aaa/24 ! to bbb.bbb.bbb.bbb/13 -> ccc.ccc.ccc.ccc/32

  map xl3 from ddd.ddd.ddd.ddd/24 to any -> eee.eee.eee.eee/32 portmap tcp/udp 20001:30000

[/CODE]

Thank you very much,

Mark

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