Michael- From the subject unable to determine the connectivity you are trying to resolve. From the output of the $ ip route command, it seems you have a host with two interfaces connected to a cable modem and they are assigned ip addresses in two different subnets and that seems to be working. Are there other hosts in your network you'd like to connect with and are unable to reach? Regards, -Jamie On Tue, Nov 8, 2022 at 1:05 PM Mike Wright <nobody(a)nospam.hostisimo.com&gt; wrote: > > On 11/8/22 09:09, Michael D. Setzer II via users wrote: > > Probable a simple solution, but its been a while since I done this type of stuff. > > > > Have a cable modem that has 4 ports but using 2. > > First port gets public IP xxx.xxx.233.11 with private network 192.168.16.x > > Second port gets public IP xxx.xxx.234.251 with private network 192.168.24.x > > > > ip route > > default via 192.168.16.1 dev enp8s0 proto dhcp metric 100 > > default via 192.168.24.1 dev wlp7s0 proto dhcp metric 600 > > 192.168.16.0/24 dev enp8s0 proto kernel scope link src 192.168.16.101 metric 100 > > 192.168.24.0/24 dev wlp7s0 proto kernel scope link src 192.168.24.13 metric 600 > > > > Years ago, had setup a Redhat 9 machine that had 9 ethernet interfaces. > > 1 connected to college backbone, and 8 that connect to 8 separate classrooms with each having its > > own private network. Used IPtables and had it all able to communicate with any machine in any > > classroom, and all machines used a squid server running on same machine getting a 40% cache hit > > ratio. So know it can be done. > > > > In searching found pages that say shouldn't have two default routes, but that it what it shows on > > systems connect to both networks by default. Many things work, but others don't. > > > > Some things mentioned > > echo 1 >> /proc/sys/net/ipv4/ip_forward > > > > Which I recall needing before, but didn't seem to solve issue? > > Ping works between networks, but traceroute doesn't. > > > > Wondering if there is a simple solution. > > I seem to recall that the default route is determined by which default > was defined most recently. That would be the first one listed by "ip > route". > > I have a multi-homed router with only one default route. Each other > port has a 10.something.1 address. Route to an interface's gateway can > be specified in the network scripts or manually added with: > > "ip route add a.b.c.0/24 via a.b.c.1 dev ethX" (assuming GW is .1) > > I use iptables FORWARD rules to decide which services are available > to/from which interfaces and ports. > > You can also enable forwarding in /etc/sysctl.conf > > "net.ipv4.ip_forward=1" and/or "net.ipv6.ip_forward=1" > > To reload sysctl.conf issue "sysctl -p" and it will display changes in > sysctl.conf since last time (re)loaded. > > Hope that's helpful, > Mike Wright > _______________________________________________ > users mailing list -- users(a)lists.fedoraproject.org > To unsubscribe send an email to users-leave(a)lists.fedoraproject.org > 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@lists.fedoraproject.org > Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue

On Wed, 2022-11-09 at 03:09 +1000, Michael D. Setzer II via users wrote: The setup you have here is fundamentally different from the one you used in the past. there you had different downstream networks, here you are combinigupstream networks. What do you need the 2 public IP adresses for? With what you have here packets from the internal network to the internet will gate routed to the gateway with the lowest metric. So all originating traffic will go out over the 192.168.16.1 gateway. As long as that gateway can reach the desired destination you are fine. Traffic originating from the outside to the second public IP will get to your box (through your .24.x gateway. Responses will however be sent to the preferred gateway (the Other gateway) and will probably be dropped there as there no connection on that gateway. you modem setup seems to be pretty strange. Please describe what the different public IP addresses are to be used for and what your box is to do with them. The modem splitting the public IP-addresses over different interfaces seems to suggest that there is to be some isolation between them. But then you seem to be combining these networks again, something that is probably not desirable I you want to just allow routing of pure internal traffic to the second network you may need to disable the setting of the default route on the second interface

On 9 Nov at 16:43, Community support for Fedora users <users(a)lists.fedoraproject.org&gt; wrote: Hmm. If it's only temporary, you might save yourself heartache by doing a big-bang cutover in this case. You could also have changed the metrics. Just a thought. Cheers, -- Dave Ihnat dihnat(a)dminet.com