Hi.
My company's LAN has been having problems since August 2001. In particular, an "intermittent browser" problem (including client email attempts to connect to email server) is the worst, and is priority one to get solved. The LAN has about 25 workstations that have internet access through a Socks5 proxy on an NT 4.0 server, connected to the internet via Cable modem. The intermittence seems to occur at times in the day when traffic is heaviest on the LAN. Some pertinent information:
Physical:
* Cabling is a mix-match of Cat4 (old cabling within building walls) & Cat5 (any newly purchased cabling)
* Hubs & Switches are mix-match of 10, 10/100, & 100 Mbps
Servers:
* 2 Netware 5.0 servers acting as routers for subnets (x.x.43.x & x.x.28.x), running both TCP/IP & IPX, 1 server acting as DHCP server for x.x.28.x subnet & primary time server, packet forwarding is on
* 1 Netware 4.11 server with x.x.59.x subnet only running IPX, acting as DHCP server for x.x.43.x subnet, packet forwarding is on
* 1 NT 4.0 server running Socks5 proxy (we also have been trying to implement Permeo's E-border proxy for more security - we have an evaluation edition installed & about 5 people have been testing the software since March 2001), Wildcat email server, workgroup shares, DNS.
* All servers are multi-homed (all connect to x.x.10.x subnet “backbone” 100 Mbps Hub), and the second NIC is connected to their respective subnets’ hubs servicing the nodes/workstations on the subnets. There are about 65 nodes total; 10 on x.x.59.x (IPX only), 35 on x.x.28.x (TCP/IP & IPX), 20 on x.x.43.x (TCP/IP & IPX).
Things I’ve tried:
* Running logs monitoring socks connections to analyze why packets were not reaching destinations
* Looked at Routing tables to determine if packets were being routed to different destinations
* Monitored bandwidth utilization on NT server
* Checked with Cable ISP for bandwidth/DNS issues
* Mapped physical topology of network, including cabling quality, NIC speeds, & hub/switch speeds
The problem appears to be on the LAN because when workstations have internet connectivity issues, you can browse the internet from the NT server.
Can anyone suggest any other solutions, or possible avenues to look down?
Thanks.
My company's LAN has been having problems since August 2001. In particular, an "intermittent browser" problem (including client email attempts to connect to email server) is the worst, and is priority one to get solved. The LAN has about 25 workstations that have internet access through a Socks5 proxy on an NT 4.0 server, connected to the internet via Cable modem. The intermittence seems to occur at times in the day when traffic is heaviest on the LAN. Some pertinent information:
Physical:
* Cabling is a mix-match of Cat4 (old cabling within building walls) & Cat5 (any newly purchased cabling)
* Hubs & Switches are mix-match of 10, 10/100, & 100 Mbps
Servers:
* 2 Netware 5.0 servers acting as routers for subnets (x.x.43.x & x.x.28.x), running both TCP/IP & IPX, 1 server acting as DHCP server for x.x.28.x subnet & primary time server, packet forwarding is on
* 1 Netware 4.11 server with x.x.59.x subnet only running IPX, acting as DHCP server for x.x.43.x subnet, packet forwarding is on
* 1 NT 4.0 server running Socks5 proxy (we also have been trying to implement Permeo's E-border proxy for more security - we have an evaluation edition installed & about 5 people have been testing the software since March 2001), Wildcat email server, workgroup shares, DNS.
* All servers are multi-homed (all connect to x.x.10.x subnet “backbone” 100 Mbps Hub), and the second NIC is connected to their respective subnets’ hubs servicing the nodes/workstations on the subnets. There are about 65 nodes total; 10 on x.x.59.x (IPX only), 35 on x.x.28.x (TCP/IP & IPX), 20 on x.x.43.x (TCP/IP & IPX).
Things I’ve tried:
* Running logs monitoring socks connections to analyze why packets were not reaching destinations
* Looked at Routing tables to determine if packets were being routed to different destinations
* Monitored bandwidth utilization on NT server
* Checked with Cable ISP for bandwidth/DNS issues
* Mapped physical topology of network, including cabling quality, NIC speeds, & hub/switch speeds
The problem appears to be on the LAN because when workstations have internet connectivity issues, you can browse the internet from the NT server.
Can anyone suggest any other solutions, or possible avenues to look down?
Thanks.
