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Issue: Speed of the internet service - DNS latency

Description

Some clients may experience that speed of internet service decreased. It more likely may appear after on-boarding, just after DNS configuration.

 

Environment

  • DNS / CNAME
  • Proxy

 

Cause

  • #1 - Slow DNS server

OR

  • #2 Wrong DNS configuration

OR 

  • Both #1 and #2 (worst situation)

 

For #1:

Can check with DIG command:

mceclip2.png

Higher number of msec means that service will be slow.

 

For #2:

DNS CNAME chain can cause high latency

mceclip3.png

 

 

 

 

Resolution

Use hosts file to configure local DNS record and check if performance increased.

In case of slow DNS (#1 Cause), customer needs to get better DNS service. Silverline cannot impact this.

Wrong configuration (#2 Cause) can be repaired by removing weakest and obsolete links from DNS config so that there will be only one CNAME:

mceclip4.png

 

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