inside global and outside global?

Trying to make sense of this from the Todd Lammel book but thought I would ask here to see if someone here can give me another explanation on it. I just want to make sure I understand all my weak areas before my test.

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inscom.brigade

I think I saw that today has to do with NAT, PAT, or DHCP.

I just got back on a route I will see if I can find it.

edit: cant find it sorry,

gbdavidx

Im pretty sure that has to deal with natting, when you take your external ip address and convert it to the internal ip address

Zartanasaurus

Inside global are your internal IPs after being NAT translated for the public internet.
Outside global are public internet IPs you're connecting to.

One man's inside global is another man's outside global.

Ismaeljrp

Zartanasaurus wrote: »

Inside global are your internal IPs after being NAT translated for the public internet.
Outside global are public internet IPs you're connecting to.

One man's inside global is another man's outside global.

Cool way to put it

. But yeah, If it's outside, it's Internet side, or another network that's not your's. If it's Global, it's Public IP. If it's, local, it's a private IP.

TurK-FX

jsb515 wrote: »

Trying to make sense of this from the Todd Lammel book but thought I would ask here to see if someone here can give me another explanation on it. I just want to make sure I understand all my weak areas before my test.

Inside global: The address of the inside host as seen from the outside
Inside local: The address of the inside host as seen from the inside
Outside local: The address of the outside host as seen from the inside
Outside global: The address of the outside host as seen from the outside

jsb515

I made this in paint lol but I am correct on my labels?

click to enlarge

insideoutside.jpg

Zartanasaurus

jsb515 wrote: »

I made this in paint lol but I am correct on my labels?

click to enlarge

No.

Inside local is the actual address of the device from the perspective of inside your network (you got this right).
Inside global is the inside local address translated into a public IP. This is the IP the public internet sees you using. You have inside global listed as the router's inside link. If would be the router's outside link or the NAT pool you are using.

Outside global is the public IP of some server you're connecting to (you got this right). Of course, your outside global is his inside global if you flip perspectives.
Outside local is a little more rare. It's the outside global translated into an inside address for your network.

jsb515

so i have outside local and inside global reversed, don't know why but this confuses the heck out of me lol

jsb515

so i think i'm starting to get the terms down, I understand how nat, pat works but these terms just cause my brain to short circuit a bit lol

is this image correct now?

insideoutside.jpg

xXErebuS

jsb515 it looks right except the outside local; the outside local is actually a private IP address inside your network... so Google is say 74.125.134.102 but you nat it so on the inside of your network its 192.168.1.200; this is known as destination nat...

xXErebuS

Attachment not found.

I hope this helps and doesn't over complicate things. Please excuse the quick drawing.

NAT_Basics.pdf

jsb515

xXErebuS wrote: »

jsb515 it looks right except the outside local; the outside local is actually a private IP address inside your network... so Google is say 74.125.134.102 but you nat it so on the inside of your network its 192.168.1.200; this is known as destination nat...

so would the gateway be considered a outside local?

see updated image again

insideoutside.jpg

networker050184

No, it wouldn't be the address of the gateway. Its the address of an outside device as it appears on the local network. Outside local will usually be the same as outside global unless you are doing something like destination NAT like xXErebuS pointed out.

jsb515

gotcha thanks everyone for helping me hammer this in my head and thanks for the pdf xXErebuS!

this article also helped

https://supportforums.cisco.com/docs/DOC-8526

FrankGuthrie

Hmm, watching a video bij INE i states the following about the outside zones:

Outside Global => The IP you’re trying to reach (The Public IP address of the WWW server)
Outside Local => If NAT is also done on the network where the WWW server is, the IP address is also translated to an IP address local to that network. So the IP address of the Inside Global address (which is the public address we get translated to on R1) is translated to an Outside Local. So our Internet IP address is then an outside address on the network of the WWW server, but it’s translated to an IP range local on the network of the WWW server, hence the Outside Local.