Tom H writes:
On Sun, Jun 26, 2016 at 8:51 PM, Sam Varshavchik mrsam@courier-mta.com wrote:
For the longest time I had /etc/sysconfig/network-scripts/eno2 specify:
TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes NAME=wan0 UUID=71e6ac4b-c693-4c20-aa0d-e1a63b7373fe ONBOOT=yes IPADDR1=216.254.115.102 PREFIX1=24 IPADDR2=216.27.136.223 PREFIX2=24 HWADDR=0C:C4:7A:32:C1:83 IPADDR=216.254.115.190 GATEWAY=216.254.115.1 PREFIX=24
This host has three IP addresses, and up until now the default IP address for outgoing IP traffic was always 216.254.115.190, specified by IPADDR.
It appears that, right now, all of my outbound traffic now appears to come from one of the other IP addresses, 216.254.115.102.
This is true even if the outgoing socket explicitly binds to 216.254.115.190:
What's the output of "ip r"?
# ip r default via 216.254.115.1 dev eno2 proto static metric 100 192.168.0.0/24 dev eno1 proto kernel scope link src 192.168.0.1 metric 100 216.27.136.0/24 dev eno2 proto kernel scope link src 216.27.136.223 metric 100 216.254.115.0/24 dev eno2 proto kernel scope link src 216.254.115.102 metric 100
If the default route's not from "190", you should be able to force it with "SRCADDRC=".
The default route appears to be set by add_default_route() in network- functions.
The "# Set a default route." blurb in ifup-eth, that you are referring to, is not being used for some reason I have not been able to determine. Putting "SRCADDR=216.254.115.190" made no difference. Neither is using IPADDR0 and PREFIX0 instead of IPADDR and PREFIX; nor ordering IPADDR/PREFIX before IPADDR[12] and PREFIX[12].
The path of least resistance for me appears to be is to swap the .102 IP address on this machine with another IP address, leave only one assigned IP address in this /24. With the default route to this /24, the kernel will have no choice but to use the other IP address.