On 6/14/25 11:28 AM, Patrick Dupre via users wrote:
Hello, I tried to fix a small issue that I have. PC A is connected to internet through a USB port. This PC A has 2 RJ45 cards, connected to 2 PC: B and C. Both interface are in shared to other computers The problem is this one. I use /etc/hosts to put a name to each PC connected to A. PC A is normally always started first. If PC B and PC C are started always in the same order, there is no problem. But if I change the starting order, then I cannot connect to them from PC A. Initially, I configured Automatic DHCP on both (PC B and PC C). To avoid the issue, I set the configure Manually, but it does not really solve the issue. It seems that PC A configures the interface connected to PC C in 10.42.0.1 if PC C is started before PC B, and in 10.42.1.1 if PC C is started after PC B. In theory, I should not care, but it seems that if PC C is connected first to the interface then it is set in 10.42.0.1, then PC C address has to be something like 10.42.0.204 while if the interface has been set in 10.42.1.1, PC C address has to be like 10.42.1.204. How can I solve this issue? On PC A: Do I need to switch from shared to other computers to Manual? If Yes how should I configure ? 10.42.1.0 255.255.255.0 Gateway? DNS ? Thank.
Hi Patrick, Did you ever get this solved? I personally would have used a hub to connect everybody up. Five port layer two switching hubs are pretty cheap no-a-days. https://www.trendnet.com/products/gigabit-switch/5-port-gigabit-desktop-switch-TEG-S51 Or if you want an external firewall, which induces the hub, this is a bit more expensive and requires a bit of firewall knowledge to operate: https://www.watchguard.com/wgrd-products/tabletop/firebox-t25 If not, then: I do not know if this will help you or not, but to get ports to forward, I run this inside my iptables firewall: # Check and force Masquerading MasqStatus=`cat /proc/sys/net/ipv4/ip_forward` if [ "$MasqStatus" = "0" ]; then echo 1 > /proc/sys/net/ipv4/ip_forward logger -p user.notice -t firewall "Warning: IP FORWARDing forced." fi Just try the (as root) # echo 1 > /proc/sys/net/ipv4/ip_forward by itself Also, would you open a terminal and post the following for both working and not working? netstat -rn It will show who is up and who is down, plus who is acting as a gateway. It will let us all know what exactly is going on. -T -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
