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Internet reply problem

By bitter01 ·
Our receiving of Internet pages has become way too slow. The browser message that we get is: ?Web site found, Waiting for reply?, this pops up immediately. It would take any where from 3 to 15 minutes to download a full page to the PC. After furtheranalyization, we realized that only the PC?s whose IP address was in a specific part of the subnet were slow. This problem was not noticed overnight. But over a period of say several months.

All the 172.24.8.x client computers experience no problems using the Internet. All others IP addresses encountered the problem of ?Web site found, waiting for reply?. This would take any where from 3 to 15 minutes to receive a full page.

ACME Configuration:
? Network: 172.24.8.0
? IP Addressing: Static
? Subnet Mask: 255.255.248.0
? We have no DNS service, we use WINS.
? Firewall and Gateway address 172.24.8.15
? Available addresses: 172.24.8.x to 172.24.15.x.
? Firewall: Gauntlet 4.1 on a BSD UNIX operating system (configured for the primary DNS)

Comments and observations during our testing of this issue:
? When we change the IP address of the PC to a .8, the problem disappears.
? When we change the Gateway to access the Internet from our other T1 line, the problem disappears.
? There are no other network performance issues within the LAN.
? From the Firewall server 172.24.8.15, when we do a traceroute to any of the 172.24.8.x computer, the reply is immediate, but to any other IP number in the subnet, the reply takesseveral minutes.
? We have rebooted the firewall and router several times. It did not make any difference

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Internet reply problem

by Stillatit In reply to Internet reply problem

Check your router to make sure that your subnet mask is correct in the router.

Check your ISP to make sure that their routing to you is correct. They may have messed up the mask so that they have a static route for 172.24.8, but they only get the rest by route discovery.

The fact that your Gateway makes a difference might be significant. Is the ISP routing different subnets to each router? Is the traffic going out one T1 and trying to come back in the other, and being blocked by the firewall?

I tried to traceroute to your firewall, and it blocked at 12.119.90.69. If that is not your router, it may be indicative of the problem.

Good luck.

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Internet reply problem

by bitter01 In reply to Internet reply problem

The question was auto-closed by TechRepublic

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Internet reply problem

by schannachie In reply to Internet reply problem

Hi,

As I see I can't know if the router you reseted is internal or external, but that is only another device to check. You have to be sure that :

1.- Check out the static routes of your network. Use the tracrt command form a windows box, it may be a workstation or not. You have to point the tracert at the gateways, routers, firewalls, etc. And you will know if you have a missing route.

2.- Point out all the falied addresses

3.- Check out the wins configuration and the hosts fileson your NT server. These files are at C:\winnt\system32\drivers\etc\hosts or lmhosts, this depends on your tcp/ip configuraions on the tcp/ip services, at the protocol setup. This file enables to resolve tcp/ip addresses of your network. All the addresses of your network that not are windows must have to be configured there.

4.- Check out that the routes match form one internal gateway to the external gateway. This is that your win client's gateway has (i.e.) to match with the internal router's gateway, this one to the firewall's internal interface, the firewall's internal interface with the firewall's default gateway that is the same address that the gateway of the ISP's router. And your inside server has to reachit (use command route print ).

5.-Now check out the firewall. The firewall has to be able to reach both, your internal net and the internet. To do so the commands are :

ifconfig ---- ipconfig
traceroute -- tracert
route ------- route print
nslookup ---- nslookup
At most unix-linux and BSD OSs the configuration files are at the /etc and the names are

/etc/route.conf -- routing configuration file
/etc/hosts ---- host configuration


Hope it helps

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Internet reply problem

by bitter01 In reply to Internet reply problem

The question was auto-closed by TechRepublic

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Internet reply problem

by bitter01 In reply to Internet reply problem

This question was auto closed due to inactivity

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