Forum Discussion
SSHSSH_97332
Nimbostratus
NimbostratusLink Controller Listeners
I Cannot Feel to understand the listenert Correctly , Ifound the below example at the document ( Attached ) :
Link Router Address Uplink Address ISP
isp1 192.168.5.5 192.168.5.6 ISP1
isp2 192.168.10.5 192.168.10.6 ISP2
The next task in this implementation is to configure two listeners, one that
detects DNS traffic bound for SiteRequest from each of the ISPs.
>>>>>>>>>> My Question : What does this means , i think DNS request are recived from Clints to ISps not from ISps as mentioned ?above ?
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To create the listener for ISP1
1. On the Main tab of the navigation pane, expand Link Controller
and click Listeners.
2. Click Create.
3. In the Destination box, type the self IP address on which the Link
Controller listens for traffic from ISP 1.
For this example, type 10.10.10.1.
4. Click Finished.
To create the listener for ISP2
1. On the Main tab of the navigation pane, expand Link Controller
and click Listeners.
2. Click Create.
3. In the Destination box, type the self IP address on which the Link
Controller listens for traffic from ISP 1.
For this example, type 10.20.10.1.
4. Click Finished.
*******************************
>>>>>>> My Question : From the above , are 10.10.10.1 & 10.20.10.1 a self IPs for Link Controller Internal Vlans ? but here we have only one internal vlan ( are those 2 Ips on this internal vlan ? )
Also , configuring Self IP as listener , does this mean that LInk Controlleer will act as DNS Proxy , from where will it get DNS enteries to respond ?
6 Replies
FredR_30652Hi,
10.10.10.1 & 10.20.10.1 are floating IP in each ISP vlans (external) , the box listen on 53 tcp port for the DNS request.
The LC will act as a Name Server , he will get the entries from the Wide IP list in his config , each Wide IP (FQDN) own members (Virtual servers) with IP adress in ISP1 or ISP2.
So DNS request for www.example.com send to the LC will be awnsered regarding the Wide IP www.example.com with Vs example-ISP1 10.10.10.100 or Vs example-ISP2 10.20.10.100.
Regards,
Fred
SSHSSH_97332Thanks Alot , I got it now
How Can i make sure that DNS Request of the connecting Client will reach Link Controller ( Usually the Client Has his own ISP DNS configured on his PC )- FredR_30652Hi,
You need a real DNS server for the example.com zone
2 entries for your LCs
ns1.example.com A 10.10.10.1
ns2.example.com A 10.20.10.1
and your host delegated to the LC
; Delegated sub-zone: www.example.com.
www NS ns1.example.com
www NS ns2.example.com
Et voilà !
The client request his own ISP DNS who request your ISP DNS who delegate to your LC.
Regards,
Fred - SSHSSH_97332Hi FredR , Many Thanks , but it seems a little hard for me :)
i understood the point that the Client will DNS request to his ISP , this ISP should request my ISP DNS & Finally my ISP DNS will delegate to LC
for the above entries you mentioned Can you explain alittle more , i think you are referring to entries that will be put at DNS
ns1.example.com A 10.10.10.1
ns2.example.com A 10.20.10.1
>>>>>> These entries will be put at my ISP DNS or client ISP DNS ? these are the self IPs of F5 , why to add entries for ? or these are the Virtual Servers IPs ?
www NS ns1.example.com
www NS ns2.example.com
>>>>>>What are these entries ? where to put it ? - FredR_30652Hi,
Sorry i will try to be more clear.
All this entries are in your DNS provider and you are the owner of example.com domain.
You may need a A record for each listener (one IP/ISP listening on port 53) ns1 is Name Server Isp 1 . example.com (ns2 is for ISP2) but call then what ever you want.
Suppose you want to load balance the links (ISP1/ISP2) for www.example.com , your main web site.
You need to "say" in your DNS zone (example.com) that www(.example.com) is resolved by (NS entrie for Name Server) ns1 or ns2 (or wath ever the name of your LCs).
Without A records for LCs , i think the DNS config will be :
; Zone example.com
www NS 10.10.10.1
www NS 10.20.10.1
Regards,
Fred - SSHSSH_97332Thanks Alot
