network problem

30 pts.
Tags:
Cisco
Cisco 2800
Cisco Routers
LAN
Hi experts, I want to connect with a web server in remote end using leased line connectivity through Cisco 2800 series router I have a flat network with 500 users in network. All PC’s default gateways are configured the IP of routers Ethernet. When I am ping the web server from LAN it is taking more time to get replay than usual. Some times it takes 60ms to 2600ms and some times the message “request time out” I can access all internal servers in my LAN easily. But I am not able to access the web server in the remote end. If I connect only some users to LAN then I can access web server easily So I don’t think it’s the problem of router connectivity. From two week am facing this problem, before it was working fine Plz help me……..

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It sounds like either the WAN link is overloaded or the webserver link is overloaded. You will need to look at the available capacity on these links to see if additional bandwidth needs to be added. If you have users running internet radio or streaming media, the link can be very quickly overloaded. I would recommend using some type of webfiltering to manage non-business related traffic so business related traffic can have best performance possible.

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  • carlosdl
    I agree with Labnuke99. It looks like an overloaded link. There are programs that will help you monitor your network, and determine which hosts are generating more traffic than expected. Network Probe is one of them.
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  • Nb0x
    You can rule out the the web server since you are seeing missed ping packets, an overloaded web server will generally respond to pings even under high load. The increased ping times are indicative of an overloaded link. To verify this pretty quickly you can use an snmp based monitoring tool like stg grapher for example. See link; http://www.wtcs.org/informant/free_snmp_tools.htm I would suggest you monitor the ethernet interface of the 2800 (the interface connected to your local switch). If the utilization rate of this interface is greater than the bandwidth of the circuit then this will confirm root cause. To point stg to the router you will need the local address of the router (def gw address), the snmp community string and the OIDs associated with the bits/second in and bits/second out of the interface. The correct OIDs (I think) are; locIfipInOctets 1.3.6.1.4.1.9.2.2.1.1.44 locIfipOutOctets 1.3.6.1.4.1.9.2.2.1.1.45 You will need the snmp index of the interface too which is appended to the OIDs above (if the ifindex is say 3 then you would use 1.3.6.1.4.1.9.2.2.1.1.44.3 for InOctets) An Octet is a byte by the way so multiply by 8 to convert to bits. Hope this helps.
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  • Intrnetworking
    The webserver could be dropping pings during times of high utilization due to a misconfigured NIC or switch port setting. Be sure to hard-set the speed and duplex on both the server and the switch. You might be surprised with how many problems this can fix. Autonegotiate should be disabled on all server NICs and switch ports. In the IT trenches? So am I - read my IT-Trenches blog
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