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Home > Archive > alt.certification.cisco > November 2002 > DNS Relay & ISDN Question
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DNS Relay & ISDN Question
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| Hello Group Again --
Well I have my 2524 router doing it's thing on my ISDN link and actually am
able to unplug my ISDN line from my DIVA LAN modem and plug it into the
router and ping out on the internet with both channels bound.
BUT !!! There is something that I can't get to work and I would appreciate
any thoughts from the group on this.
The DIVA modem will declare the DNS server address as 0.0.0.0 - After the
line connects it seeks out and finds the DNS servers from my ISP. The
inside users declare the DNS address as the DIVA LAN address 192.168.1.1
and the DIVA Modem then acts as a DNS relay to forward and receive DNS
translations between the outside ISP DNS Server and inside users. I am
trying to figure out how to replicate this process on my 2524 and so far
have come up empty. I can cheat and simply put 206.24.xx.xxx as the DNS
address on teh inside users, but I wuld like to emulate the DIVA ISDN Modem
DNS Relay process.
Any help would be greatly appreciated
TIA
Dan
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| Hansang Bae 2002-11-20, 9:24 pm |
| In article <3ddafde3$0$1460$ac966d11@news.raex.com>, DanG@Home.com says...
> Hello Group Again --
>
> Well I have my 2524 router doing it's thing on my ISDN link and actually am
> able to unplug my ISDN line from my DIVA LAN modem and plug it into the
> router and ping out on the internet with both channels bound.
>
> BUT !!! There is something that I can't get to work and I would appreciate
> any thoughts from the group on this.
>
> The DIVA modem will declare the DNS server address as 0.0.0.0 - After the
> line connects it seeks out and finds the DNS servers from my ISP. The
> inside users declare the DNS address as the DIVA LAN address 192.168.1.1
> and the DIVA Modem then acts as a DNS relay to forward and receive DNS
> translations between the outside ISP DNS Server and inside users. I am
> trying to figure out how to replicate this process on my 2524 and so far
> have come up empty. I can cheat and simply put 206.24.xx.xxx as the DNS
> address on teh inside users, but I wuld like to emulate the DIVA ISDN Modem
> DNS Relay process.
> Any help would be greatly appreciated
You can use NAT to translated the DNS requests, or setup DHCP on your router
******************************
******************************
**************
From: Question 62
Date: 02 February 2002
Subject: How do I setup DHCP service on my router?
Answer by: Dave Phelps <tippenring@nospam.bigfoot.com>
Here is my 1601 performing as a DHCP server config...
The static pool is how I use DHCP to assign the same IP to the same PC
each time, essentially a static IP address assignment. The only other
requirement would be that on the interface DHCP requests will be
received, if you have an inbound ACL, bootp must be permitted.
ip dhcp excluded-address 192.168.3.1 192.168.3.9
!
ip dhcp pool dhcp-pool
network 192.168.3.0 255.255.255.0
default-router 192.168.3.1
netbios-node-type b-node
dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
!
ip dhcp pool static-pool
host 192.168.3.2 255.255.255.0
client-identifier 0100.00c5.0cbd.7e
client-name main_pc
default-router 192.168.3.1
dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
*************** USE ROT13 TO SEE MY EMAIL ADDRESS ****************
******************************
******************************
********
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
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| |
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| Hansang Bae <uonr@alp.ee.pbz> wrote in
news:MPG.1846143371f8623a989f9f@news-server.nyc.rr.com:
> In article <3ddafde3$0$1460$ac966d11@news.raex.com>, DanG@Home.com
> says...
>> Hello Group Again --
>>
>> Well I have my 2524 router doing it's thing on my ISDN link and
>> actually am able to unplug my ISDN line from my DIVA LAN modem and
>> plug it into the router and ping out on the internet with both
>> channels bound.
>>
>> BUT !!! There is something that I can't get to work and I would
>> appreciate any thoughts from the group on this.
>>
>> The DIVA modem will declare the DNS server address as 0.0.0.0 - After
>> the line connects it seeks out and finds the DNS servers from my ISP.
>> The inside users declare the DNS address as the DIVA LAN address
>> 192.168.1.1 and the DIVA Modem then acts as a DNS relay to forward
>> and receive DNS translations between the outside ISP DNS Server and
>> inside users. I am trying to figure out how to replicate this process
>> on my 2524 and so far have come up empty. I can cheat and simply put
>> 206.24.xx.xxx as the DNS address on teh inside users, but I wuld like
>> to emulate the DIVA ISDN Modem DNS Relay process.
>> Any help would be greatly appreciated
>
>
> You can use NAT to translated the DNS requests, or setup DHCP on your
> router
>
>
> ******************************
******************************
***********
> ***
>
> From: Question 62
> Date: 02 February 2002
> Subject: How do I setup DHCP service on my router?
> Answer by: Dave Phelps <tippenring@nospam.bigfoot.com>
>
> Here is my 1601 performing as a DHCP server config...
> The static pool is how I use DHCP to assign the same IP to the same PC
>
each time, essentially a static IP address assignment. The only other
> requirement would be that on the interface DHCP requests will be
> received, if you have an inbound ACL, bootp must be permitted.
>
> ip dhcp excluded-address 192.168.3.1 192.168.3.9
> !
> ip dhcp pool dhcp-pool
> network 192.168.3.0 255.255.255.0
> default-router 192.168.3.1
> netbios-node-type b-node
> dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
> !
> ip dhcp pool static-pool
> host 192.168.3.2 255.255.255.0
> client-identifier 0100.00c5.0cbd.7e
> client-name main_pc
> default-router 192.168.3.1
> dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
>
>
>
Thanks - Back to the drawing board ..
I'll try the nat route and dhcp this weekend
| |
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| DanG <DanG@Home.com> wrote in news:3dddaa0a$0$17652$ac966d11
@news.raex.com:
> Hansang Bae <uonr@alp.ee.pbz> wrote in
> news:MPG.1846143371f8623a989f9f@news-server.nyc.rr.com:
>
>> In article <3ddafde3$0$1460$ac966d11@news.raex.com>, DanG@Home.com
>> says...
>>> Hello Group Again --
>>>
>>> Well I have my 2524 router doing it's thing on my ISDN link and
>>> actually am able to unplug my ISDN line from my DIVA LAN modem and
>>> plug it into the router and ping out on the internet with both
>>> channels bound.
>>>
>>> BUT !!! There is something that I can't get to work and I would
>>> appreciate any thoughts from the group on this.
>>>
>>> The DIVA modem will declare the DNS server address as 0.0.0.0 - After
>>> the line connects it seeks out and finds the DNS servers from my ISP.
>>> The inside users declare the DNS address as the DIVA LAN address
>>> 192.168.1.1 and the DIVA Modem then acts as a DNS relay to forward
>>> and receive DNS translations between the outside ISP DNS Server and
>>> inside users. I am trying to figure out how to replicate this process
>>> on my 2524 and so far have come up empty. I can cheat and simply put
>>> 206.24.xx.xxx as the DNS address on teh inside users, but I wuld like
>>> to emulate the DIVA ISDN Modem DNS Relay process.
>>> Any help would be greatly appreciated
>>
>>
>> You can use NAT to translated the DNS requests, or setup DHCP on your
>> router
>>
>>
>> ******************************
******************************
***********
>> ***
>>
>> From: Question 62
>> Date: 02 February 2002
>> Subject: How do I setup DHCP service on my router?
>> Answer by: Dave Phelps <tippenring@nospam.bigfoot.com>
>>
>> Here is my 1601 performing as a DHCP server config...
>> The static pool is how I use DHCP to assign the same IP to the same PC
>>
> each time, essentially a static IP address assignment. The only other
>> requirement would be that on the interface DHCP requests will be
>> received, if you have an inbound ACL, bootp must be permitted.
>>
>> ip dhcp excluded-address 192.168.3.1 192.168.3.9
>> !
>> ip dhcp pool dhcp-pool
>> network 192.168.3.0 255.255.255.0
>> default-router 192.168.3.1
>> netbios-node-type b-node
>> dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
>> !
>> ip dhcp pool static-pool
>> host 192.168.3.2 255.255.255.0
>> client-identifier 0100.00c5.0cbd.7e
>> client-name main_pc
>> default-router 192.168.3.1
>> dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
>>
>>
>>
>
>
> Thanks - Back to the drawing board ..
> I'll try the nat route and dhcp this weekend
>
Yes but looking again - I 've gotten DHCP et al to work - BUT!!! the router
needs to have a known DNS server IP - What I am saying is that the router
needs to find an external DNS server and then advertise itself as the local
DNS Server and then reroute those requests to the newly found server. Act
as a relay... That is what I am having trouble doing. All the other good
stuff is greatly appreciated and I am going to try it this weekend.
Thanks again.
Dan
| |
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| DanG <DanG@notech.com> wrote in
news:3dde3e7b$0$1412$ac966d11@
news.raex.com:
Thanks to everyone so far. Although I didn't plan to start on this until I
got into BCRAN, I am pretty close to getting it done -
I have everything working - Laptop can do ipconfig /renew - get the right
stuff - fire up ISDN and http . BUT - if possible I would like to get this
one last thing done - maybe it is not possible, that would be good to know
as well.
I would like to change:
ip dhcp pool dhcp-pool
dns-server 198.133.219.25 to dns-server 192.168.1.21 -
the same as the default router and use the 2524 as a DNS relay to relay
requests to the DNS server at 198.133.219.25. Can it be done ?
Thanks
Dan
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 2524-1
!
enable password sanfran
!
!
!
!
!
ip subnet-zero
no ip finger
no ip domain-lookup
ip dhcp excluded-address 192.168.1.0 192.168.1.200
!
ip dhcp pool dhcp-pool
network 192.168.1.0 255.255.255.0
default-router 192.168.1.21
netbios-node-type b-node
dns-server 198.133.219.25
!
isdn switch-type basic-ni
!
!
!
!
!
interface Ethernet0
ip address 192.168.1.21 255.255.255.0
ip nat inside
!
interface Serial0
no ip address
shutdown
!
interface Serial1
no ip address
shutdown
!
interface BRI0
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-ni
isdn spid1 33055522220101 3305552222
isdn spid2 33055533330101 3305553333
no cdp enable
ppp authentication chap pap callin
!
interface Dialer1
description Connection To Internet
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
dialer remote-name Rxxx
dialer idle-timeout 600
dialer string 3305554444 class 56k
dialer hold-queue 10
dialer load-threshold 1 either
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname xxx
ppp chap password xxxxx
ppp pap sent-username xxx password xxxxxxxxxxx
ppp multilink
!
router rip
network 192.168.1.0
!
ip nat inside source list 101 interface Dialer1 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
no ip http server
!
!
map-class dialer 56k
dialer isdn speed 56
access-list 101 permit ip 192.168.1.0 0.0.0.255 any
dialer-list 1 protocol ip permit
no cdp run
!
!
line con 0
exec-timeout 0 0
logging synchronous
transport input none
line aux 0
line vty 0 4
exec-timeout 0 0
password sanfran
logging synchronous
login
!
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