Tonight in trying to switch out an Instagate EX firewall with a SonicWall TZ180 - an unusual problem occurred.
The internal network was not responding like it should once we disconnected the Instagate from the network. You ping the machines and get responses, but you could not log into them for services.
For example: We had one machine with 10.1.2.187 that runs internal FTP services. The other station had an IP of 10.1.2.132. Both machines had a subnet of 255.255.252.0. The .132 machine could ping .187 just fine with quick response. But whenever you attempt to connect to .187 via an FTP client, it times out and refuses to connect. Same thing happens with the new SonicWall plugged in. But when the Instagate is plugged back in, all machines can log into the .187 via an FTP client just fine.
It makes no sense since the Instagate seems to be doing something that I am unaware of on the LAN. As just being the firewall, I'm not understanding what it has to do with a machine connecting or not connecting since all machines are on the same subnet.
If anyone has any ideas or clues would be most helpful. Thank you in advance!
-G
The internal network was not responding like it should once we disconnected the Instagate from the network. You ping the machines and get responses, but you could not log into them for services.
For example: We had one machine with 10.1.2.187 that runs internal FTP services. The other station had an IP of 10.1.2.132. Both machines had a subnet of 255.255.252.0. The .132 machine could ping .187 just fine with quick response. But whenever you attempt to connect to .187 via an FTP client, it times out and refuses to connect. Same thing happens with the new SonicWall plugged in. But when the Instagate is plugged back in, all machines can log into the .187 via an FTP client just fine.
It makes no sense since the Instagate seems to be doing something that I am unaware of on the LAN. As just being the firewall, I'm not understanding what it has to do with a machine connecting or not connecting since all machines are on the same subnet.
If anyone has any ideas or clues would be most helpful. Thank you in advance!
-G
