I am new to Linux and am working on this project which has a linux server and windows hosts. configuration is as follows:
linux server: 10.10.10.177/24
default route to gw 10.10.10.1
windows host: 10.20.20.253/24
default route to gw 10.20.20.1
both the gateways are on the same L3-switch. VLAN 23 is 10.10.10.1 & VLAN 99 is 10.20.20.1.
Here's the issue:
from the server i can ping the gateways and the host as well. but the host can't ping the server. the host can ping the gateways.
during troubleshooting, i removed the servers cable from switch port and connected my
laptop to the switch. doing this, the windows host can ping my laptop !?!
i have added a default route on the linux server
route add default gw 10.10.10.1
still no use 🙁
if anyone out there can help, i'd greatly appreciate.
Best Answer
There seems to be a firewall blocking your ping requests on either the gateway or the linux server. Routers typically block the ICMP protocol ports (required to complete a ping request). However, ping isn't the only way to "locate" your server from your host. You may alternately try one of these methods:
1) If you have a HTTP web-server running on the server, run “telnet 10.10.10.177 80″ from the command line on your host. This checks for an open service on port 80 (HTTP). If the telnet request succeeds, you have the connectivity.
2) If you have internet running on the server, then you can install a proxy server such as squid on the server and try to connect to internet from the host machine.
3) Similar telnet requests can be sent to ports 443, 21 and 25 for HTTPS, FTP & SMTP services respectively (if you have any of these services running on the server).