DNS

[Tareq Emad Al Asfoor]

Hi all, 

I'm trying to create IP SLA for DNS .. I can ping the ip from cisco and can get trace for it . but when i show the ip sla for DNS i get error return code 

Latest operation start time: 20:44:34 UTC Sun Apr 24 2016
Latest operation return code: Timeout
Number of successes: 0
Number of failures: 1
Operation time to live: Forever

Any advice ... Thanks in advance  

[Philip D'Ath · Accepted solution]

Can you please show us your config which is not working.

A typical DNS test I would use is:

ip sla 1
  dns www.google.com name-server 8.8.8.8 source-ip a.b.c.d

[Tareq Emad Al Asfoor]

Thank.. 

Now i'm trying to create the http IP sla 

ip sla 1
http get http://www.msn.com/en-ae/ name-server 8.8.8.8

I get this error ..

IPSLA operation id: 1
Latest RTT: 281 milliseconds
Latest operation start time: 08:56:09 UTC Mon Apr 25 2016
Latest operation return code: Http Error
Latest DNS RTT: 94 ms
Latest TCP Connection RTT: 93 ms
Latest HTTP Transaction RTT: 94 ms
Number of successes: 0
Number of failures: 5
Operation time to live: Forever

Any advice please .. Thanks in advance 

[Philip D'Ath]

Try requesting a specific page.  A url like that is likely to return a 302 or something other than a successful result.  A good test of something specific is retrieving an image or logo off a page.

[Tareq Emad Al Asfoor]

Thanks, Can you give small example please .. Also the https pages like facebook and so supporting here with this IP SLA ? Thanks in advance 

[Philip D'Ath]

What is you companies web site url?

[Tareq Emad Al Asfoor]

this one .. http://www.btc.com.sa/

[Philip D'Ath]

ip sla 1
  http get http://www.btc.com.sa/flash/AC_RunActiveContent.js name-server 8.8.8.8

[Tareq Emad Al Asfoor]

The Same 

IPSLA operation id: 1
Latest RTT: 571 milliseconds
Latest operation start time: 10:28:55 UTC Mon Apr 25 2016
Latest operation return code: Http Error
Latest DNS RTT: 363 ms
Latest TCP Connection RTT: 103 ms
Latest HTTP Transaction RTT: 105 ms
Number of successes: 0
Number of failures: 1
Operation time to live: Forever

Any advice ... Thanks in advance 

[Philip D'Ath]

From the router can you:

telnet www.btc.com.sa 80

and get a result?

[Tareq Emad Al Asfoor]

S.W#telnet www.btc.com.sa 80
% Bad IP address or host name

This what i get ...

[Tareq Emad Al Asfoor]

Any update please ? Thanks in advance 

[Philip D'Ath]

That means you don't have name resolution configured correctly on the router.  Have you either got a DNS view defined or some name-server lines?

ip name-server 8.8.8.8 8.8.4.4

[Tareq Emad Al Asfoor]

Thanks .. If i have DNS server with ip  x.x.x.x .. Then i have to create ( ip name-server  x.x.x.x ) only ? Then i apply this 

ip sla 1
  http get http://www.btc.com.sa/flash/AC_RunActiveContent.js name-server x.x.x.x 

[Philip D'Ath · Accepted solution]

You need name resolution to work first.  So add the "name-server" lines.  You can then do a test with "telnet" to make sure it connects,  And then all going well, the http sla will work.