Additional NIC disabled after clean install

[numbfx]

Hi,

I am installing SO on clean preinstalled CentOS with 3 NICs, one is hooked up to a tap, another is a management interface, and the third is for a proxy server. After SO installs I can't ping from/to, curl from, or otherwise use the third interface. I've tried changing the routing tables, setting static IPs, nothing seems to get it working.

I do get output from tcpdump on the proxy interface... I'm am testing the interface by running:

[root@securityonion ~]# ping -I enp0s20f0u5 google.com
ping: google.com: Name or service not known

and tcpdump:

02:35:35.837983 IP securityonion.39486 > 147.75.69.225.http: Flags [S], seq 4029612815, win 29200, options [mss 1460,sackOK,TS val 1650216 ecr 0,nop,wscale 7], length 0
02:35:35.840928 IP securityonion.35929 > gateway.domain: 61006+ PTR? 225.69.75.147.in-addr.arpa. (44)
02:35:37.206988 IP securityonion.59602 > gateway.domain: 529+ PTR? 1.0.17.172.in-addr.arpa. (41)
02:35:37.207000 IP securityonion.39493 > gateway.domain: 13566+ PTR? 3.1.168.192.in-addr.arpa. (42)
02:35:37.207005 IP securityonion.43655 > gateway.domain: 10987+ PTR? 1.122.168.192.in-addr.arpa. (44)
02:35:39.845958 IP securityonion.39486 > 147.75.69.225.http: Flags [S], seq 4029612815, win 29200, options [mss 1460,sackOK,TS val 1654224 ecr 0,nop,wscale 7], length 0
02:35:40.846032 IP securityonion.35929 > gateway.domain: 61006+ PTR? 225.69.75.147.in-addr.arpa. (44)
02:35:41.873996 IP securityonion.34972 > gateway.domain: 61691+ A? google.com. (28)
02:35:42.662045 IP securityonion.43714 > gateway.domain: 37993+ PTR? 1.0.17.172.in-addr.arpa. (41)
02:35:42.662054 IP securityonion.60427 > gateway.domain: 61082+ PTR? 3.1.168.192.in-addr.arpa. (42)
02:35:42.662146 IP securityonion.52166 > gateway.domain: 20116+ PTR? 1.122.168.192.in-addr.arpa. (44)
02:35:43.540706 IP securityonion.33327 > 64.225.34.103.ntp: NTPv4, Client, length 48
02:35:45.852644 IP securityonion.49655 > gateway.domain: 5136+ PTR? 2.2.168.192.in-addr.arpa. (42)
02:35:46.878197 IP securityonion.34972 > gateway.domain: 61691+ A? google.com. (28)
02:35:47.666648 IP securityonion.43714 > gateway.domain: 37993+ PTR? 1.0.17.172.in-addr.arpa. (41)
02:35:47.666920 IP securityonion.60427 > gateway.domain: 61082+ PTR? 3.1.168.192.in-addr.arpa. (42)
02:35:47.667152 IP securityonion.52166 > gateway.domain: 20116+ PTR? 1.122.168.192.in-addr.arpa. (44)
02:35:47.861959 IP securityonion.39486 > 147.75.69.225.http: Flags [S], seq 4029612815, win 29200, options [mss 1460,sackOK,TS val 1662240 ecr 0,nop,wscale 7], length 0
02:35:50.856961 IP securityonion.49655 > gateway.domain: 5136+ PTR? 2.2.168.192.in-addr.arpa. (42)
02:35:51.883004 IP securityonion.59531 > gateway.domain: 17921+ A? google.com.h4x-1337. (37)
02:35:55.380803 IP securityonion.37403 > gateway.domain: 43579+ PTR? 1.0.17.172.in-addr.arpa. (41)
02:35:55.380819 IP securityonion.43648 > gateway.domain: 60094+ PTR? 3.1.168.192.in-addr.arpa. (42)
02:35:55.380885 IP securityonion.52904 > gateway.domain: 27772+ PTR? 1.122.168.192.in-addr.arpa. (44)
02:35:55.862340 IP securityonion.36024 > gateway.domain: 59455+ PTR? 1.2.168.192.in-addr.arpa. (42)
02:35:56.883332 IP securityonion.59531 > gateway.domain: 17921+ A? google.com.h4x-1337. (37)
02:36:00.384961 IP securityonion.52904 > gateway.domain: 27772+ PTR? 1.122.168.192.in-addr.arpa. (44)
02:36:00.385083 IP securityonion.37403 > gateway.domain: 43579+ PTR? 1.0.17.172.in-addr.arpa. (41)
02:36:00.385169 IP securityonion.43648 > gateway.domain: 60094+ PTR? 3.1.168.192.in-addr.arpa. (42)
02:36:00.862811 IP securityonion.36024 > gateway.domain: 59455+ PTR? 1.2.168.192.in-addr.arpa. (42)

Prior to installing SO it works fine, I can ping, curl and it has it's own IP and gateway. Can someone please explain how to fix this?

Thank you,

Jonathan

[TOoSmOotH]

https://developer.gnome.org/NetworkManager/stable/nmcli.html

We disable unused interfaces at the end of the installer. You can re-enable them however you want post install.