Ping reply time varies from Cisco ASA5520 to ISP gateway.
I have newly deployed network. I have two ASA5520-AIP20-k9. both connected to ISP and configured as Active/standby failover. the ASAs were working fine at first but later on, the internet connection becomes very slow. the ping reply i am getting from my next hop(ISP router) varies during the peak hour is some times in 2000 msec or above but during off hours, the ping reply time is 1 and 2 msec.
when I directly connect my laptop to the link that comes from the ISP its ping reply is 1msec and 2msec.
I thought the ping reply of the ASA5520 to the ISP gateway should be constant and should be 1 and 2 msec regardsless of the traffic passing through the firewall. can anyone help how to resolved this problem.
'I thought the ping reply to the ISP gateway should be constant and should be 1 and 2 msec' --> Not correct.
It all depends on the traffic usage on the interface connected to ISP (provided everything else is correct with ASA & ISP).
Based on your observation- 'peak hour is some times in 2000 msec or above but during off hours, the ping reply
time is 1 and 2 msec'
It appears that there is lot of internet activity from the users. If you have a monitoring tool, check to see usage during peak hours.Or you can use 'Show inter' to get an idea by looking at the counters. Monitoring will give you better insight.
Another place to look into- how the ASA connecting to ISP gateway? Thru Media converters/ long run cables or gateway device is located in the same closet as the ASA? Media converters might cause issues as well.
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