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I was just looking at the routing on my notebook computer (running Linux), which has both Ethernet and WiFi connections, by using the ip (-6) route show command.  For IPv4, it shows my local lan, via ethernet has a metric of 1 and WiFi, 2.  No surprise here, as I'd expect it to favour Ethernet.  But when I check again for IPv6, both connections show the same metric of 256 and the default route, via the link local address, both have a metric of 1024.

 

Why do the metrics for IPv6 appear to be so much greater than IPv4 and why do the two connections have the same metrics for IPv6, but different for IPv4?

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Strange...I'm not seeing anything like that on Windows

 

 

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.100.1 192.168.100.191 266
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
192.168.56.0 255.255.255.0 On-link 192.168.56.1 276
192.168.56.1 255.255.255.255 On-link 192.168.56.1 276
192.168.56.255 255.255.255.255 On-link 192.168.56.1 276
192.168.100.0 255.255.254.0 On-link 192.168.100.191 266
192.168.100.191 255.255.255.255 On-link 192.168.100.191 266
192.168.101.255 255.255.255.255 On-link 192.168.100.191 266
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.56.1 276
224.0.0.0 240.0.0.0 On-link 192.168.100.191 266
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.56.1 276
255.255.255.255 255.255.255.255 On-link 192.168.100.191 266
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 192.168.100.1 Default
0.0.0.0 0.0.0.0 192.168.100.1 Default
0.0.0.0 0.0.0.0 192.168.100.1 Default
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
11 266 ::/0 fe80::21d:a2ff:feaf:2ffc
1 306 ::1/128 On-link
11 18 2001:470:c27d:f000::/64 On-link
11 266 2001:470:c27d:f000:e5a8:7a95:1acb:983e/128
On-link
13 276 fe80::/64 On-link
11 266 fe80::/64 On-link
13 276 fe80::cdf7:690d:2c19:237/128
On-link
11 266 fe80::e5a8:7a95:1acb:983e/128
On-link
1 306 ff00::/8 On-link
13 276 ff00::/8 On-link
11 266 ff00::/8 On-link
===========================================================================
Persistent Routes:

 

Do you have 2 interfaces on that computer?  On my notebook, both Linux and Windows show different IPv4 metrics for the 2 interfaces, though with different metrics between Linux and Windows.  I don't see a metric value for IPv6 on Windows on either my computer or yours, unless I'm mis-reading the info.

 

 

No, just the one interface

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