Internet slow and disconnecting

[edwincharles]

Dears,

need help regarding my network as attached

internet/lan slow, disconnecting , not able to browse some websites

[chrihussey]

Recommend posting the config of the main L3 switch. Can't determine much based on the network diagram.

[edwincharles]

please find the config also find the route in dsl modem

[chrihussey]

Not sure, but one thing jumps out at me. For the data and wifi networks you have the DSL modem designated as the DNS server. I don't think it works that way. I would assume you would want to use the DNS server given to the modem from the provider. That information should be in the modem somewhere. In lieu of that you could try 8.8.8.8.

If you can try the change and let me know we can take it from there.

Regards

[edwincharles]

this is the dns in dsl modem

[chrihussey]

So in your DHCP scopes on the switch define those as being the DNS servers and not the DSL modem's IP.

[chrihussey]

You could also statically define the DNS servers on one of the hosts on the network as a test and see if there is a noticeable improvement. If there is, then you could adjust the DHCP scopes for all the other hosts.

[edwincharles]

ok I have added as below but still same

ip dhcp pool DATA
   network 10.10.110.0 255.255.255.0
   default-router 10.10.110.254
   dns-server 84.235.6.55 84.235.57.230 8.8.8.8
   lease 7
!
ip dhcp pool WIFI
   network 10.10.120.0 255.255.255.0
   default-router 10.10.120.254
   dns-server 84.235.6.55 84.235.57.230 8.8.8.8
   lease 7

still same

[chrihussey]

Looks like our posts crossed paths. Once you made the change in the scopes, did you reboot a device so it would acquire the new DNS?

[edwincharles]

yes restarted the pc

[chrihussey]

Regardless, I'd keep the DNS settings the way you now have them.

Is it possible you are saturating the DSL link and just don't have the bandwidth?

Is this something that is intermittent that comes and goes?

Test your throughput with something like speedtest.net.

After running the speed test, adjust the load interval on the switch port to the Linksys to 30 seconds "load-interval 30". Clear the counters and then check the utilization after a couple of minutes "sh int f1/0/48" (I think that's the port to the DSL modem).

Also, check this switchport when you are having trouble getting to the Internet and post the output.

Doesn't look like there are any configuration issues, you are not doing anything overly complicated. Just need to figure out what is happening.

[edwincharles]

speed test shows good speed, but slow in browsing and some websites not opening

[chrihussey]

Yeah, not seeing an issue from a networking perspective here. Is connectivity on the local LAN slow or just to the Internet?

If it is just to the Internet it might be a browser setting or something along those lines.

Only other thing to suggest is to check the CPU on the switches, make sure there isn't a device broadcasting or consuming lots of bandwidth, or generating lots of port errors.

[edwincharles]

Dears,

anyone can help me on this

its urgent

internet disconnects

[chrihussey]

Don't see anything significant. The issue may be in the DSL / provider's domain. You're upload speed is about 400k at best which could be a possible choke point. 

If you connect your laptop directly to the DSL modem do you get the same results?