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5
Helpful
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Application Slow with Router ACL

vamsi harish
Level 1
Level 1

Hi,

 

We have been facing a strange issue in our network. When we implement an ACL on a router or a L3 switch at branch end the Citrix App launch or any other web services are getting slow. But when we access the same application without ACL, it's very fast. I did check the latency from network side with and with out ACL, but didn't find any delay. Kindly suggest what can cause this kind of issue.

 

Thanks,

1 Accepted Solution

Accepted Solutions

Jon Marshall
Hall of Fame
Hall of Fame

You have probably blocked some ports that are needed such as DNS for name lookups etc. 

 

Easiest thing to do is to temporarily add a deny line and log it so you can see what is being blocked. 

 

Jon

View solution in original post

3 Replies 3

Yachay
Level 1
Level 1

Please, could you add a simple diagram indicating which interface your ACL is applied on, hosts, direction and some lines of the ACL?

Jon Marshall
Hall of Fame
Hall of Fame

You have probably blocked some ports that are needed such as DNS for name lookups etc. 

 

Easiest thing to do is to temporarily add a deny line and log it so you can see what is being blocked. 

 

Jon

We did the same and allowed the required dependencies which were getting blocked earlier. Now the application started working normal. Thanks for your response.

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