06-18-2008 03:34 PM
Dear Sir,
I have 2 x 11501 in front of 2 x web server. Now we need the web server act as smtp relay to send outgoing mail.
I do not think the mail need load balancing. I found the following configuration does not work. When I execute the "nslookup", I cannot get to the DNS server, which is ouside the Internet.
service PISWEBP01
redundant-index 31
ip address 10.106.13.20
active
service PISWEBP02
redundant-index 32
ip address 10.106.13.21
active
owner PIS_PISWEBP0102
content PIS-DNS-VIP-1
vip address 10.106.13.224
port 53
protocol tcp
redundant-index 35
add service PISWEBP01
add service PISWEBP02
active
content PIS-SMTP-VIP-1
vip address 10.106.13.224
port 25
protocol tcp
redundant-index 34
add service PISWEBP01
add service PISWEBP02
active
Any idea why?
Thanks.
06-19-2008 03:01 PM
Hi Joseph,
It is not really clear what you are trying to do. You have a content rule configured for SMTP (port 25) which is used for load balancing, however you say you don't need load balancing and that the servers actually need to send outgoing mail
So my question is, is this traffic generated from the servers to the outside?
Or is traffic balanced to the servers?
Is the CSS the default gateway of the servers?
06-19-2008 03:08 PM
Yes, the web server will generate outgoing nslookup and send outgoing mail only.
The default gateway is configured.
Thanks
06-19-2008 03:23 PM
So, are the servers pointing the CSS as their default gateway?
or is there any other layer 3 device that will be gateway for the servers?
Is the CSS backend and frontend on the same VLAN?
Can you provide a show run?
If the CSS is not balancing SMTP to those servers, what is the content rule for?
Usually in order to route traffic to the outside you would use group on the CSS to NAT to an IP on the external network, like this:
group outbound
service xxxx1
service xxxx2
vip address xx.xx.xx.xx
active
06-24-2008 12:22 PM
also don't forget that dns lookup are udp based unless you are doing a zone transfer
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