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From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/buttons.html | 109 ++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/content.html | 277 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/index.html | 29 +++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/media.html | 21 ++ 4 files changed, 436 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/buttons.html new file mode 100644 index 0000000..20edd9d --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_6/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +

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+ +	1.1		+ Scaling Networks with NAT + and PAT
	+ 1.1.6		+ Troubleshooting NAT and PAT + configuration

+ + + + + + +

+ + + When IP connectivity problems in a NAT environment exist, it is often + difficult to determine the cause of the problem. Many times NAT is + mistakenly blamed, when in reality there is an underlying problem.

+ + + When trying to determine the cause of an IP connectivity problem, it + helps to rule out NAT. Use the following steps to determine whether + NAT is operating as expected:

Based on the configuration, clearly define what NAT is supposed + to achieve.

Verify that correct translations exist in the translation table.

Verify the translation is occurring by using + + + show + and + + + debug + commands.

Review in detail what is happening to the packet and verify that + routers have the correct routing information to move the packet + along.

+ + + Use the + + + debug ip nat + command to verify the operation of the NAT + feature by displaying information about every packet that is + translated by the router. The debug ip nat + detailed + command generates + a description of each packet considered for translation. This command + also outputs information about certain errors or exception conditions, + such as the failure to allocate a global address.

+ + + Figure shows + a sample + + + + debug ip nat + output. In this example, the + first two lines of the debugging output show that a Domain Name System + (DNS) request and reply were produced. The remaining lines show the + debugging output of a Telnet connection from a host on the inside of + the network to a host on the outside of the network. + +

+ + + Decode the + + + + debug + output by using the following key points: + +

+ + + The asterisk next to NAT indicates that the translation is occurring + in the fast-switched path. The first packet in a conversation will + always go through the slow path, which means this first packet is + process-switched. The remaining packets will go through the + fast-switched path if a cache entry exists. + +
+ + + s = a.b.c.d is the source address. + +
+ + Source address a.b.c.d is translated to + w.x.y.z. +
+ + d = e.f.g.h is the destination address. + +
+ + + The value in brackets is the IP identification number. This + information may be useful for debugging. This is useful, for + example, because it enables correlation with other packet traces + from protocol analyzers. + +

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+ + + + + Lab Activity
+ +
Lab Exercise: Troubleshooting NAT and PAT
+ +
In this lab, the student will configure + a router for Network Address Translation (NAT) and Port Address + Translation (PAT).
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+ + + + Lab Activity
+ +
e-Lab Activity: Troubleshooting NAT and PAT
+ +
In this lab, the student will configure + a router for Network Address Translation and Port Address + Translation.
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+ + Web Links
+ + +
Verifying NAT Operation and Basic NAT Troubleshooting
+ + http://www.cisco.com/en/US/tech/ + tk648/tk361/technologies_tech_ note09186a0080094c32.shtml
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