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The Internet downs every 30 minutes Situation: One of clients called and told us that their Internet access kept down every 30 minutes. They have two subnets, one is main office LAN 10.0.0.0/16 and another is 192.168.5.0/24 for the DMZ doing web sites and FTP. There are two Cisco PIX 515 Firewalls connecting a Cisco router for the Internet access. One firewall connects to the LAN. Another and another firewall connects to the DMZ. When the Internet downs, they could ping any public IPs from the LAN firewall while no user could ping a public IP from workstation. Also, web server in the DMZ could access the Internet without any problems. Clear xlate didn’t fix the problem. If they reset the LAN firewall, it worked for 30 minutes to 1 hour. Then they needed to reset it again. What we did.
After reset the firewall: C:\Documents and Settings\blin> arp -a 10.0.0.2 Interface: 10.0.0.25 --- 0x10004 Internet Address Physical Address Type 10.0.0.2 00-12-80-cb-da-56 dynamic After the internet down: C:\Documents and Settings\blin>arp -a 10.0.0.2 Interface: 10.0.0.25 --- 0x10004 Internet Address Physical Address Type 10.0.0.2 00-01-55-10-14-ed dynamic Problem: after searching for the device, 00-01-55-10-14-ed. We found that the client just added a Promise storage server that was using the same IP of the firewall, 10.0.0.2. Br default, the storage server use IP 10.0.0.2. We changed the IP to 10.0.0.200, and then they don't have this problem any more. Post your questions, comments, feedbacks and suggestions Related Topics
Slow Internet Access - Case Study
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