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Debian GNU/Linux (Buster)
There are 2 computers on my LAN. I'll call one Fast and the other Slow. When
I, for example, type ping www.cbs.com, Fast pings right away, Slow pauses for
about 5 seconds ('time' says that). When I ping something in /etc/hosts, both
start right away. On Slow, 'route' takes the 5 second pause, but 'route -n' is
fast. On Fast, both are equally snappy.
It didn't used to be that way. They both used to be snappy. And I can't
figure out why.
Routing tables:
Fast:
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.200.184.254 0.0.0.0 UG 0 0 0 enp8s0
localnet 0.0.0.0 255.255.255.0 U 0 0 0 enp8s0
216.17.134.0 0.0.0.0 255.255.255.0 U 0 0 0 enp7s0
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.200.184.254 0.0.0.0 UG 0 0 0 enp8s0
10.200.184.0 0.0.0.0 255.255.255.0 U 0 0 0 enp8s0
216.17.134.0 0.0.0.0 255.255.255.0 U 0 0 0 enp7s0
Slow:
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.200.184.254 0.0.0.0 UG 0 0 0 eth0
10.200.184.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
link-local 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
216.17.134.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.200.184.254 0.0.0.0 UG 0 0 0 eth0
10.200.184.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
216.17.134.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
(169.254.0.0 in IANA -- no idea why that's in there. It's not mentioned in
/etc/network/interfaces.)
Both these are built by the same version of the OS on boot. Why they're
different, I have no idea -- Fast has 2 Ethernet holes, Slow has 1 (configured
as eth0 and eth0:1 to get to the 2 nets). I've tried removing the link-local
line from the Slow's table -- doesn't seem to make any difference.
Other than routing, Slow (with i5 CPU, DDR4 RAM, same clock speed) runs circles
around Fast.
--
Glenn English
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