Slow internet speed after ASA 5508

[hisham@comverge.my]

Hello,

Recently i just installed an ASA5508 for a client, They using D-link adsl Modem connected to the Cisco Router 4321 and then the router connected to my ASA on interface GE 1/3 for outside and my inside interface is connected to GE1/1 to Cisco Catalyst 4507R+E.

But the client complaining internet was so slow after deploying the ASA, i ask the ISP to check and after they checking , they said that the problem is with the ASA . Then i notice got some discussion about slow internet speed after through ASA in the community , so i follow some of the  troubleshoot such as  error in the interface , duplex and speed for interface but it still the same. For the error i have checked that no error in the inside and outside interface of ASA and for the speed and duplex i already set it to auto.

Here i attached the configuration for the ASA.

I'd really like some suggestion or ideas on what causing this or where to start looking because i not really sure where to begin.

[Dennis Mink]

Any reason why your provider claims it is the ASA?

also, can you test through put, by plugging laptop straight behind router of DSL RTR and do a speed test.

I wouldn't blindly go on what your provider claims, especially if there is no technical backup.

also, is it intermittently "slow"?

[hisham@comverge.my]

well i cannot argue more to the ISP because the ISP came from government internet, but i do speed test behind the cisco router 4321 and the speed is 10 mb fine. Before the user came in to the building , i have check the speed test after asa and the speed is 9.8 mb, but idk why after the user came and used the internet , the speed became slower and slower.

[johnlloyd_13]

hi,

is the user on wifi? is the connection still slow when using a "wired" connection to his PC?

can you post a brief diagram and 4321 router config? try masking sensitive info.

[hisham@comverge.my]

both wifi and wired connection still slow, and for the router configuration i cannot get it because the provider is from the government internet and he say its confidential.