On 2020-08-03 18:21, ToddAndMargo via users wrote: > Hi Ed, > > Okay, lets look at this as a network detective. > > You start only know that there are two network connections. > One to the to Internet, which I will call the Black connection. > The other one to the internal network, which I will call the > Red connection. You need to know which is which.
Just a note of caution. Just because a default route exists it does not necessarily follow that that it will lead to the Internet. But, I doubt you're talking about cases where that would be. > > Currently > > $ netstat -rn > Kernel IP routing table > Destination Gateway Genmask Flags MSS Window irtt > Iface > 0.0.0.0 192.168.250.1 0.0.0.0 UG 0 0 0 eno2 > 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 > 192.168.250.0 0.0.0.0 255.255.255.0 U 0 0 0 eno2 > 192.168.255.0 0.0.0.0 255.255.255.0 U 0 0 0 br0 > > and > > $ route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use Iface > 0.0.0.0 192.168.250.1 0.0.0.0 UG 100 0 0 eno2 > 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 > 192.168.250.0 0.0.0.0 255.255.255.0 U 100 0 0 eno2 > 192.168.255.0 0.0.0.0 255.255.255.0 U 425 0 0 br0 Those are 2 ways to display the same information. As is "ip route show". > > > both tell me that "eno2" is the Black connection and "br0" is > the Red connection. "virbr0" is also Red, but that is > another story. And that the ONLY connection that has > a gateway is "eno2". (More that one and all hell breaks > loose.) > > In the above, I can determine: > > Red network = 192.168.255.0/24 > Black network = 192.168.250.0/24 > Black Gateway = 192.168.250.1 > > The giveaway is the "G" flag You can glean the same info from nmcli. nmcli -f GENERAL.DEVICE,IP4.ADDRESS,IP4.GATEWAY,IP4.ROUTE device show. For which I get on my system. GENERAL.DEVICE: enp2s0 IP4.ADDRESS[1]: 192.168.1.18/24 IP4.GATEWAY: 192.168.1.1 IP4.ROUTE[1]: dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100 IP4.ROUTE[2]: dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 100 GENERAL.DEVICE: virbr0 IP4.ADDRESS[1]: 192.168.122.1/24 IP4.GATEWAY: -- IP4.ROUTE[1]: dst = 192.168.122.0/24, nh = 0.0.0.0, mt = 0 GENERAL.DEVICE: wlp4s0 IP4.ADDRESS[1]: 192.168.2.127/24 IP4.GATEWAY: 192.168.2.5 IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.2.5, mt = 600 IP4.ROUTE[2]: dst = 192.168.2.0/24, nh = 0.0.0.0, mt = 600 IP4.ROUTE[3]: dst = 192.168.56.0/24, nh = 192.168.2.116, mt = 600 And you now know the device names, IP address of the devices, you know the gateways, and dst=0.0.0.0/0 is equivalent to "G". > > So, I do believe you are connect. "nmcli" can not > tell me who is Red and who is Black. "route" or > "netstat" are what is initially called for. I *didn't* say that at all. In another message I said nmcli can't tell you if the gateway is UP. And, neither can netstat or route. And, that I thought was your goal to verify the gateway being up. For that, you normally use ping. -- The key to getting good answers is to ask good questions. _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@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
