Cannot Access Internet After Connecting to VPN (Cisco, Sonicwall, Etc)

Sometimes when in the IT Support field you will almost always have to deal with remote users. These users typically require VPN access to connect to the network to access their data and company data. Whether they are using Microsoft's VPN, Sonicwall GlobalVPN Client, or Cisco VPN, you may all run into this issue.

If a user complains that once they are connected successfully to the VPN, but is unable to go out into the internet, you can try these steps. Sometimes there are things like "Split Tunnel" which can be turned on, but in some cases, even if this is on, it will not resolve the issue. When this happens, you can create a batch script and have the user run these commands to resolve the issue. It is sort of a workaround, but can be used for crutch situations.

1. Open Command Prompt by Clicking Start > Run > Type CMD > Hit Enter.

2. Type these following commands:

route delete 0.0.0.0
route add 0.0.0.0 mask 0.0.0.0 192.168.1.1

*Important: CHANGE 192.168.1.1 to your local GATEWAY address (router/firewall address)*

3. Done

You can create a batch script and the user launch it after connecting to VPN, as once they disconnect and reconnect they will lose the settings. This can be done by opening up notepad, inputing the two commands, and then saving it as a.BAT file. Once you save this file, the user can launch this after VPN connection.

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IPv6 (Cisco) Training - Using the "(IKE) Policy "authentication" Command

This article is for all you Cisco security buffs out there.

The "authentication" for Internet Key Exchange (IKE) policy command; is a Cisco IOS "ISAKMP Policy Configuration" mode command; that is used to specify the authentication method used within an Internet Key Exchange (IKE) policy. 

Below are the proper syntax and an example of the "authentication (IKE) policy" command: 

Syntax:   authentication {rsa-sig | rsa-encr | pre-share}

Example:

Router>enable
Router#configure terminal
Router(config)#crypto isakmp policy 1
Router(config-isakmp)#authentication pre-share
Router(config-isakmp)#exit
Router(config)#
 
In the above example; An ISAKMP policy is being created (configured) with a priority of 1 (one); and the authentication method that is to be used for the ISAKMP policy is "pre-share". 
 
Now, let's say a network administrator (like you) previously sets an authentication method for an ISAKMP policy, but, now decides to "reset" the authentication method to the default value; to reset a authentication method to default, use the "no authentication" like you see in the example below.
 
Example:
 
Router>enable
Router#configure terminal
Router(config)#crypto isakmp policy 1
Router(config-isakmp)#no authentication
Router(config-isakmp)#exit
Router(config)#
 
The "authentication" (IKE) policy command Keywords explained:
 
rsa-sig - This keyword is used to specify the use of RSA signatures as the authentication method. But, currently this type of authentication method is not being supported in IPv6.
rsa-encr - This keyword is used to specify the use of  RSA encrypted nonces as the authentication method. But, currently this type of authentication method is also not being supported in IPv6.

pre-share - This keyword is used to specify the use of preshared keys as the authentication method, and this type of authentication method is being supported in IPv6. But, remember when using this keyword, you must also separately configure the preshared keys; by using crypto isakmp identity and crypto isakmp key commands.

I hope this article was very informative and helped you quickly understand the usage and keywords of the "authentication" (IKE) policy command. If you need to learn more about the command; I suggest you visit my website, were you'll find the latest information regarding Cisco IPv6 Design and Implementation Techniques.

To your success,  

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IPv6 (Cisco) Training - Using the "Auto-Cost" (IPv6) Command

This article is for the present and future OSPF (IPv6) network administrators.

Now remembering from your CCNA days; by default, the OSPF for IPv6 protocol uses the default Mbps (megabit per second) reference value of 100 when calculating metrics (costs) for interfaces (links). But, let's say you didn't want to use the default Mbps reference value; how could you change the reference value of 100 Mbps to a different value?

The Cisco IOS "Router" configuration command named "auto-cost" is used to control (change) the Mbps reference value used (by the OSPF for IPv6 protocol) when calculating the metrics (costs) for interfaces (links). Below is the syntax and example of using the command.

Syntax:

auto-cost reference-bandwidth Mbps

The keyword "reference-bandwidth Mbps" represents the rate in Mbps (megabit per second). The range is from 1 to 4294967; and the default is 100.

Example:

router>enable
router#configure terminal
router(config)#ipv6 router ospf 1
router(config-router)#auto-cost reference-bandwidth 1000

In the above example, the auto-cost reference bandwidth is being set to 1000 Mbps (megabit per second).

Now, if after setting the Mbps reference value to a particular value; you want to return the reference value back to the default value (100 Mbps); all you need to do is type the word "no" in front of the command like so.

router(config-router)#no auto-cost reference-bandwidth 1000

OSPF for IPv6 uses the following calculation (formula) to determine the metric (cost) for an interface (link):

Mbps reference value divided by the bandwidth

Note: The "bandwidth" is determined by the use of the bandwidth (interface) command.

Below are the default metrics (costs) for certain types of interfaces (links):

o 56-kbps serial link-Default cost is 1785.
o 64-kbps serial link-Default cost is 1562.
o T1 (1.544-Mbps serial link)-Default cost is 64.
o E1 (2.048-Mbps serial link)-Default cost is 48.
o 4-Mbps Token Ring-Default cost is 25.
o Ethernet-Default cost is 10.
o 16-Mbps Token Ring-Default cost is 6.
o Fast Ethernet-Default cost is 1.
o X25-Default cost is 5208.
o Asynchronous-Default cost is 10,000.
o ATM-Default cost is 1.

Lastly, if you have multiple links with high bandwidth (such as Fast Ethernet or ATM), you might want to use a larger number to differentiate the cost on those links.

I hope this article was very informative and helped you quickly understand the usage of the "auto-cost" (IPv6) command. If you need to learn more about the command; I suggest you visit my website, were you'll find the latest information regarding Cisco IPv6 Design and Implementation Techniques.

To your success,

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IPv6 Training (Cisco) Enabling Telnet on an IPv6 router and Telnet configuration

Well, if you do not know the word "telnet" telnet is an application layer protocol that allows direct connections (with telnet sessions), can do to a Cisco router or a Cisco router. It does not matter if you use the IPv4 or the IPv6 protocol, "telnet", leads the same way.

A network administrator can "telnet" to make the following types of direct connections (telnet sessions):


To accommodateRouter
Router to router
Router-to-Host

This article will show you how to enable "telnet" IPv6 on a Cisco router, so as to be able to connect directly via telnet sessions with him, and I also show how you can initiate a "telnet" session from a Cisco router IPv6.

Here are the steps needed to "telnet" to enable IPv6 on a Cisco router:

1 Router> enable
2 Router # configure terminal
3 Router (config) # IPv6 host name [port] ipv6-address1 [ipv6-address2 ... ipv6-address4]
4 Router (config) # line [aux | console | tty | vty] line number [ending-line-number]
5 Router (config-line) # password password
6 Router (config-line) # login [local | TACACS]
7 Router (config-line) # ipv6 ipv6-access-class access-list-name {in | out}
8 Router (config-line) # end
9 Router # copy run start

And here are the steps needed to start a session "telnet" from a > Cisco IPv6 router:

1 Router> enable
2 Router # telnet host [port] [keyword]

First Steps Explained
 
Step # 1
 
1 Router> enable

Puts the router in privileged EXEC mode.

Step # 2

2 Router # configure terminal

Puts the router in global configuration mode.

Step # 3

3 Router (config) # IPv6-Host> Cisco Test 2001:0 DB8: 20:01:: 12

Defines a static hostname to IP address mapping in the cache host name.

Step # 4
 
4 Router (config) # line vty 0 4

Create an interface and router vty line configuration mode.

Step # 5
 
5 Router (config-line) # password ittechtips

Create one (ittechtips) forgets that allows Telnet.

Step# 6

6 Router (config-line) # login TACACS

Tell the router to the server TACACS password checking at login use.

Step # 7
 
7 Router (config-line) # access-class vty in ipv6-acl

Adds an IPv6 access list named acl-vty interface, remote access to Telnet sessions that limits the access list match.

Step # 8
 
8Router (config-line) # end

The causes of the router configuration mode and get back in line to exit privileged EXEC mode.

Step # 9
 
9 Router # copy run start

Save the running-config to local Non-volatile random access memory (NVRAM).

Steps second Explained

Step # 1
 
1 Router> enable

Puts router Privileged EXECMode.

Step # 2
 
2 # telnet cisco-router tests

The command "telnet" to a Telnet session from the router to a remote host, build, or through the host name or IPv6 host address. A Telnet session can be set to the name of a router or an IPv6 address.

I invite you to visit my website, where you will find the latest information regarding Cisco IPv6 Design and ImplementationTechniques.

To your success,

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IPv6 (Cisco) Training - Using the "DNS server and the domain name (IPv6)" Commands

Now that this article is a kind of long I'll be up to him to this point without further ado let us begin.

"DNS Server" (IPv6) command is a Cisco IOS "DHCP for IPv6 pool configuration command mode is a network accessible to specify the Domain Name System (DNS) server IPv6 (n).

Here is the correct syntax and example of the "DNS-server" (IPv6) command:

Syntax: Router (config-dhcp) # DNS server IPv6 address
Example:Router (config-dhcp) # dns-server 2001:0 DC8: 3000:3000:: 42

Note that the router asks for the DHCP pool configuration "mode and the argument is the IPv6 address IPv6 IPv6 address of the DNS server available.

Now, in case you were wondering, it is possible (configuration) of the "dns-server" (IPv6), the command multiple times on a router, network, if you have multiple DNS servers on your computer. And, the new IPv6 addresses, do not delete (overwrite) the existing (pre-) ipv6Addresses.

Although you must list server to remove a specific DNS server for DNS, all you have to do what the command is the word "no" before as you can see below:

Syntax: Router (config-dhcp) # no DNS server IPv6 address
Example: Router (config-dhcp) # no DNS server 2001:0 DC8: 3000:3000:: 42

Ok, that pretty much sums up the "DNS-server" (IPv6) command, so let's continue with the command "domain" name (IPv6).

The "domain name" (IPv6)Command is also a Cisco IOS "DHCP for IPv6 pool configuration" mode command, but is used to configure domain name RR for a DHCP client for IPv6, router, or is also known as a request.

Here is the correct syntax and example for the domain name "(IPv6) command:

Syntax: Router (config-dhcp) # domain-name domain
Example: Router (config-dhcp) # domain-name ittechtips.com

Note that the router is ready again to DHCP for IPv6 pool configuration mode and the subject domain is an indication of the domain name to be used by the client. So in the above example the router (client) ittechtips.com use of the domain name.

And just like the "DNS-server" (IPv6) command, the domain name "(IPv6) command can be used (configuration) repeatedly to be a router. And the new domain names do not delete (overwrite) existing domain name.

Finally, if you need to remove a domain name to a DHCPv6> Client (RR), you need the word "no" in front of the domain name "(IPv6) command as you can see below:

Syntax: Router (config-dhcp) # domain without domain name
Example: Router (config-dhcp) # no domain name ittechtips.com

I hope this article was very informative and helped you quickly understand the use of the DNS server and the domain name "(IPv6) command. To learn more, I suggest you visit my website, where you will find the latest informationCisco IPv6 Design and implementation techniques.

To your success,

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IPv6 (Cisco) Training - Using the "IPv4 address-family command

Well, this is the first time introduced the family name to the database command Cisco IOS IPv4 "you're in for a real treat, because this article will briefly explain the command, so without further ado let's get started.

The "family IPv4 Address" command is used primarily for multi-topology routing or BGP (MTR) network administrators (like you) command for a session, the standard use of BGP routing prefixes IPv4 addresses, configure the command can.performed both in router configuration mode (Router (config-router) # address-family IPv4) or router configuration mode scope (Router (config-router-scope) # address-family IPv4).

And here is the syntax that is used when the router in router configuration mode:

IPv4 address-family [MDT - Multicast - tunnel - Unicast [VRF] VRF-name - VRF VRF-name]

And here is the syntax that you can use if your router how to configure the router scope:

IPv4 address-family [mdt -Multicast -] unicast

Thus, after inserting the required syntax and beating (pressing) the Enter key, the router is in router configuration Address Family configuration mode "or" how to configure the router address family configuration Scope "in power.

Well, let's say you use the "address-family IPv4 precedence over a router and now you must remove the IPv4 address family configuration (your) to run configuration (running-config file), and end address Familyconfiguration mode, you can both tasks by running the simple word "no" before the command like this:

For example, in router configuration mode:

Router (config-router) # no address-family IPv4

The scope of the router configuration mode:

Router (config-router-scope) # no address-family IPv4

Here are the explanations of the IPv4 address family command keywords are:

MDT - An optional keyword that can be used for IPv4 multicast distribution tree are given(MDT) address family session.

Multicast - An optional keyword that can be used for IPv4 multicast IDs are specified.

Tunnel - An optional keyword that can be used to specify an IPv4 routing session for multipoint tunneling.

Unicast - An optional keyword that can be used to specify the IPv4 unicast address prefixes (by the way, which is standard).

vrfvrf-name - optional keyword that can be used for routing and name of the VPNForwarding (VRF) instance to associate with subsequent IPv4 address family configuration mode commands.

Finally, just in case if you wonder what the message appears when a Cisco router as router mode is in "Address family configuration Router configuration, here's an example:

Router (config-router-af) #

And here's an example of what the prompt looks like router when a Cisco router to "address the family configuration Router configurationMode:

Router (config-router-scope-af) #

I wrote this article for you quickly understand and use the keywords that are associated with the "family IPv4 Address" command, if after reading this article you are thinking that this was not enough information, and you need more, I suggest to my website that you have the techniques to find the latest information about Cisco IPv6 design and implementation.

To your success,

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IPv6 Training (Cisco) - DHCPv6 RR and DR Identification

Lately, I have many e-mail with regard to the question "What is an IPv6 DUID?

Well, an IPv6 DUID is actually a DHCP server for IPv6, or Unique Identifier (DUID). There is a demand router (RR) and a delegate Router (DR) for the identification, though it is the DHCPv6 message exchange. The DUID is unique for each request router (RR) and delegating router (DR) of the device, and format (generated) automatically from level 2 Media Access Control (MAC)"The lowest point" interface for each type of request router (RR) or Delegating Router (DR) device or a network administrator can configure manually with the help of Internet Service Provider (ISP) for information.

The reason why the DUID for requesting router (RR) and delegating router (DR) is the identifier used, because the DUID is actually "permanently" assigned to the requesting router (RR) or Delegating Router (DR), which to say, even after the requesting router (RR) orDelegating Router (DR) the device is rebooted, the router DUID for each request (RR) or Delegating Router (DR) remain unchanged. (Some might say that it is a stable DUID Identifier)

I wrote this article on the DUID, because their function is to inform you and let you know that plays an important role in the overall standings DHCP Prefix Delegation (DHCP-PD) message exchange protocol (s) occurs between the applicant wanted Router ( RR) of "customer DHCPv6"delegating router (DR) "of the DHCPv6 server.

I invite you to my website, you need to find the latest technical information on Cisco IPv6 design and implementation.

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CCNA, CCNP, Cisco, and CCENT Practice Exam - Radius, OSPF, and more!

Test your knowledge of exam topics important Cisco certification exam practice questions with these!

CCNA:

Short answer means: What do the letters "IA shows an OSPF routing table?

Answer: "IA" shows an inter-zone path - the path to a destination in another area OSPF.

CCNP / BSCI:

Short answer: Cisco OSPF design guidelines suggest a router not more than ____________ neighbors.

A: Cisco offers a single OSPF-enabledThe router does not have more than 60 neighbors.

CCNP / BCMSN:

Short Answer: Identify and briefly describe how authentication dot1x port.

Answer: The port authentication dot1x Auto mode, power is enabled (default) and the force-unauthorized. Force-approved means that the door has the right to force unauthorized means that the door can never be accepted, car ports and transmit EAP packets will be accepted only if it allows the authentication server.

CCNP /ISCW:

Identify the true statements.

A. RADIUS considers each "A" AAA, in a separate process.

B. TACACS + considers each "A" AAA, in a separate process.

C. TACACS + is able to encrypt the whole package.

D. RADIUS is able to encrypt the whole package.

Answer: B, C. RADIUS combines fact the process of authentication and authorization, making it very difficult to do one but not the others. Even while TACACS + figure the whole package,RADIUS encrypts only the password in the first client-server package.

CCNP / ONT:

What are the four priority levels built in WiFi Multimedia?

Answer: Platinum (for voice), gold (for video), silver (for everything else - best-effort) and bronze (background traffic).

Find certification practice exam questions on my website for more Cisco and this, new applications for the CCNA Security, Wireless and Voice testing!

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IPv6 Training (Cisco) - the Difference Between Stateful and Stateless DHCP

Well, instead of me just jumping right into explaining the difference between Stateful and Stateless DHCP. I'm going to slow down just a bit and briefly explain DHCP first.

DHCP stands for Dynamic Host Configuration Protocol, this client / server protocol has been around for awhile now, and is regually implemented on IPv4 networks. IPv4 DHCP, is explained in RFC 2131 and IPv6 DHCP is explained in RFC 3315. But, in a nutshell; network adminstrators use DHCP to provide a framework that is used by networked devices (DHCP clients) to obtain various necessary parameters from DHCP Servers so the DHCP clients can operate in an Internet Protocol (IP) network. Now when it comes to DHCP for IPv6 (RFC 3315), there are two ways DHCPv6 can be implemented, either Stateful or Stateless. Stateful DHCP is centrally managed on a DHCP server(s); and the DHCP clients use Stateful DHCP to obtain an IP address(es) and other useful configuration informaiton from the DHCP server(s).

But, Stateless DHCP on the other hand; means the DHCP server(s) is not required to store any dynamic state information on the DHCP server(s) about any indivisual DHCP clients. Instead, the DHCP clients autoconfigure their own IP address(es) based on router advertisments. So, with Stateless DHCP, the DHCP clients don't use the DHCP server(s) to obtain IP address(es) information, they use the DHCP server(s) to obtain the other useful configuration informaiton (like the address(es) of DNS servers).

Currently, Cisco recommends that you use Stateless DHCP instead of Stateful DHCP when implementing and deploying IPv6 networks; because, Cisco Routers are not designed to act as Stateful DHCPv6 servers. But, if you need to implement Stateful DHCP on your IPv6 network; Cisco makes a product named Cisco Network Registar (CNR) that can help you out a lot. I invite you to visit my website were you'll find the latest information regarding Cisco IPv6 Design and Implementation Techniques.

To your success,

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studiando Cisco, (p. 4)

Video subido desde mi teléfono móvil



http://www.youtube.com/watch?v=L04g7iIJy_s&hl=en

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