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IP address of 837

 
 
S W
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      11-22-2006
Hi,

I have an 837 which is running as (amongst other roles) the default
gateway for the lan.
We recently changed our lan IP address range from class b to class c. I
changed the 837 IP address with the Cisco web interface (CRWS). It works
fine in most respects. However, from a command line the Internet address
of Ethernet0 is shown as the old class b address, and the new class c IP
address is shown as the secondary ip address. As follows:

Ethernet0 is up, line protocol is up
Internet address is 128.66.1.250/16
Broadcast address is 255.255.255.255
Address determined by non-volatile memory
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Secondary address 192.168.10.250/24


I have also noticed that when I ping an external Ip address from a
machine that is denied external access by an ACL, I get a message coming
back as "Destination Net Unreachable" which is what I'd expect but the
message says it comes "from" the old class b ip address.

So, my question, (for anyone with the knowledge and inclination to
help!), is - how do I change it the IP address from the old class b one,
and what should I change it to?

Thanks in advance,
SW
 
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S W
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      11-23-2006
chris wrote:

>
>
> conf t
> int Ethernet0
> ip address 192.168.10.250 255.255.255.0
>
>
> "what should I change it to?"
>
> That's up to you!
>
>


Thanks, Chris.
I asked what to change it to because it is called the Internet address,
and I wasn't sure if it needs to be the external IP address or not.
And so if I change it to 192.168.10.250, then it will have the same
address as listed as "Secondary address". Does that matter?

Regards,
SW
 
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S W
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      11-29-2006
http://www.velocityreviews.com/forums/(E-Mail Removed) wrote:
> S W wrote:
>
>>chris wrote:
>>
>>
>>>
>>>conf t
>>>int Ethernet0
>>> ip address 192.168.10.250 255.255.255.0
>>>
>>>
>>>"what should I change it to?"
>>>
>>>That's up to you!
>>>
>>>

>>
>>Thanks, Chris.
>>I asked what to change it to because it is called the Internet address,
>>and I wasn't sure if it needs to be the external IP address or not.
>>And so if I change it to 192.168.10.250, then it will have the same
>>address as listed as "Secondary address". Does that matter?

>
>
> I think you may need to remove the secondary addres first.
>
> en
> conf t
> int Ethernet0
> no ip address 192.168.10.250 255.255.255.0 sec
> ip address 192.168.10.250 255.255.255.0
>
> end
>
> copy run start
>
> You will need to do this from a directly connected console
> since IP comms may be lost.
>

Hi,

Thanks for your help. I didn't need to remove the secondary address
first. All is OK now.

Regards,
SW
 
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S W
Guest
Posts: n/a
 
      11-29-2006
chris wrote:
> "S W" <(E-Mail Removed)> wrote in message
> news:45660885$0$8754$(E-Mail Removed)...
>
>>chris wrote:
>>
>>
>>>
>>>conf t
>>>int Ethernet0
>>> ip address 192.168.10.250 255.255.255.0
>>>
>>>
>>>"what should I change it to?"
>>>
>>>That's up to you!

>>
>>Thanks, Chris.
>>I asked what to change it to because it is called the Internet address,
>>and I wasn't sure if it needs to be the external IP address or not.
>>And so if I change it to 192.168.10.250, then it will have the same
>>address as listed as "Secondary address". Does that matter?
>>
>>Regards,
>>SW

>
>
> On an 837 the Ethernet0 address is the LAN port and ATM0/Dialer1/BVI1
> (whatever you have) is the public address. Or at least that's one way to do
> it.
>
> If you add in 192.168.10.250 as the main address then the secondary will
> disappear.
>
> Chris.
>
>

That's what I did.

Thanks for your help,
Regards,
SW
 
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