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I have a server with 4 ethernet ports: 1 used to connect to internet and 3 others used to manage 3 local subnets.

I configured the DHCP server, the routing, packet forwarding for IPv4 and NAT; everything seems to work correctly: all users can connect to the Internet from each subnet and users can ping a PC from one subnet to the other.

Here-below the content of my /etc/rc.local:

/sbin/iptables -A FORWARD -o eth0 -i eth1 -s 192.168.1.0/24 -m conntrack --ctstate NEW -j ACCEPT
/sbin/iptables -A FORWARD -o eth0 -i eth2 -s 192.168.2.0/24 -m conntrack --ctstate NEW -j ACCEPT
/sbin/iptables -A FORWARD -o eth0 -i eth3 -s 192.168.3.0/24 -m conntrack --ctstate NEW -j ACCEPT
/sbin/iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -t nat -F POSTROUTING
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

What is not working is that I can't access from subnet x to a network printer/projector on subnet y using auto-detect with the standard HP driver but I can ping it and access the printer's management page.

What am I missing?

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  • I have added info from my /etc/rc.local please let me know if you need further details
    – user234441
    Mar 27, 2015 at 14:01
  • Yes I can access the web based management page from the other subnet
    – user234441
    Mar 28, 2015 at 22:54
  • I try to reach the network printer using standard HP application but I'm not able to find it over network
    – user234441
    Mar 30, 2015 at 11:29
  • I've edited your question to have all comments into your question. Please delete all of your comments as this is starting to look like a chat room! ;-) One last question: if you type the IP address instead of using the auto-detect, does it work then? (It should!)
    – Fabby
    Mar 31, 2015 at 8:50

1 Answer 1

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If you know network address of your printer and there is no network problems accessing it, you can add a printer using CUPS web interface:

http://localhost:631

or:

http://your_server:631

Adding a printer in CUPS

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