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Full Discussion: Packet going out of wrong interface due to OS automatically added cache route with lower metric
Special Forums IP Networking Packet going out of wrong interface due to OS automatically added cache route with lower metric Post 303004831 by msr1981 on Tuesday 10th of October 2017 04:02:16 AM
Old 10-10-2017
Please see below output of ip -6 route show.

default route is
Code:
default via 2405:200:370:237::1 dev bond1  metric 1

specific route for network that was added:
Code:
2405:200:370:10::/64 via 2405:200:370:236::1 dev bond0.236  metric 1024

cache route added automatically by OS with metric 0 was as below.
Code:
2405:200:370:10::20 via 2405:200:370:237::1 dev bond1  metric 0  cache

This cache route caused packet to go out of default route instead of the specific route. Destination IP is not reachable from the default route. cache route had to be deleted manually for normal traffic to resume.
--------------------------------------------------------------------------


Code:
ip -6 route show 
unreachable ::/96 dev lo  metric 1024  error -101
unreachable ::ffff:0.0.0.0/96 dev lo  metric 1024  error -101
unreachable 2002:a00::/24 dev lo  metric 1024  error -101
unreachable 2002:7f00::/24 dev lo  metric 1024  error -101
unreachable 2002:a9fe::/32 dev lo  metric 1024  error -101
unreachable 2002:ac10::/28 dev lo  metric 1024  error -101
unreachable 2002:c0a8::/32 dev lo  metric 1024  error -101
unreachable 2002:e000::/19 dev lo  metric 1024  error -101
2405:200:201:400:172:16:21:156 via 2405:200:370:243::1 dev bond3.243  metric 1024 
2405:200:201:400:172:16:21:157 via 2405:200:370:243::1 dev bond3.243  metric 1024 
2405:200:310:15::2a via 2405:200:370:240::1 dev bond2.240  metric 0  cache 
2405:200:310:15::56 via 2405:200:370:240::1 dev bond2.240  metric 0  cache 
2405:200:310:15::/64 via 2405:200:370:240::1 dev bond2.240  metric 1024 
2405:200:311:230::11 via 2405:200:370:230::1 dev bond3.230  metric 0  cache 
2405:200:311:230::/64 via 2405:200:370:230::1 dev bond3.230  metric 1024 
2405:200:311:247::11 via 2405:200:370:243::1 dev bond3.243  metric 0  cache 
2405:200:311:247::12 via 2405:200:370:243::1 dev bond3.243  metric 0  cache 
2405:200:311:247::13 via 2405:200:370:243::1 dev bond3.243  metric 0  cache 
2405:200:311:247::/64 via 2405:200:370:243::1 dev bond3.243  metric 1024 
2405:200:314:170::/64 via 2405:200:370:236::1 dev bond0.236  metric 1024 
2405:200:360:10::/64 via 2405:200:370:236::1 dev bond0.236  metric 1024 
2405:200:370:10::20 via 2405:200:370:237::1 dev bond1  metric 0  cache 
2405:200:370:10::/64 via 2405:200:370:236::1 dev bond0.236  metric 1024 
2405:200:370:16::2a via 2405:200:370:240::1 dev bond2.240  metric 0  cache 
2405:200:370:16::56 via 2405:200:370:240::1 dev bond2.240  metric 0  cache 
2405:200:370:16::/64 via 2405:200:370:240::1 dev bond2.240  metric 1024 
2405:200:370:228::/64 dev bond3.228  proto kernel  metric 256 
2405:200:370:230::/64 dev bond3.230  proto kernel  metric 256 
2405:200:370:231::/64 dev bond4  proto kernel  metric 256 
2405:200:370:234::/64 dev bond3.234  proto kernel  metric 256 
2405:200:370:236::/64 dev bond0.236  proto kernel  metric 256 
2405:200:370:237::/64 dev bond1  proto kernel  metric 256 
2405:200:370:238::/64 dev bond0.238  proto kernel  metric 256 
2405:200:370:239::/64 dev bond0.239  proto kernel  metric 256 
2405:200:370:240::/64 dev bond2.240  proto kernel  metric 256 
2405:200:370:242::/64 dev bond3.242  proto kernel  metric 256 
2405:200:370:243::13 dev bond3.243  metric 0  cache 
2405:200:370:243::/64 dev bond3.243  proto kernel  metric 256 
2405:200:370:244::/64 dev bond2.244  proto kernel  metric 256 
2405:200:a10:fc82::/64 via 2405:200:370:243::1 dev bond3.243  metric 1024 
unreachable 3ffe:ffff::/32 dev lo  metric 1024  error -101
fe80::/64 dev bond0  proto kernel  metric 256 
fe80::/64 dev bond1  proto kernel  metric 256 
fe80::/64 dev bond2  proto kernel  metric 256 
fe80::/64 dev bond3  proto kernel  metric 256 
fe80::/64 dev bond4  proto kernel  metric 256 
fe80::/64 dev eno4  proto kernel  metric 256 
fe80::/64 dev ens1f3  proto kernel  metric 256 
fe80::/64 dev bond0.236  proto kernel  metric 256 
fe80::/64 dev bond0.238  proto kernel  metric 256 
fe80::/64 dev bond0.239  proto kernel  metric 256 
fe80::/64 dev bond2.240  proto kernel  metric 256 
fe80::/64 dev bond2.244  proto kernel  metric 256 
fe80::/64 dev bond3.228  proto kernel  metric 256 
fe80::/64 dev bond3.230  proto kernel  metric 256 
fe80::/64 dev bond3.234  proto kernel  metric 256 
fe80::/64 dev bond3.242  proto kernel  metric 256 
fe80::/64 dev bond3.243  proto kernel  metric 256 
fe80::/64 dev ens6f3  proto kernel  metric 256 
default via 2405:200:370:237::1 dev bond1  metric 1

----------------------------------------------------------
Configuration for the bond is as follows.

Code:
 /etc/sysconfig/network-scripts ] cat route6-bond0.236
  2405:200:370:10::/64 via 2405:200:370:236::1 dev bond0.236
  2405:200:314:170::/64 via 2405:200:370:236::1 dev bond0.236
  2405:200:360:10::/64 via 2405:200:370:236::1 dev bond0.236

Code:
 /etc/sysconfig/network-scripts ] cat ifcfg-bond0.236 
  DEVICE=bond0.236
  BOOTPROTO=none
  ONBOOT=yes
  VLAN=yes
  IPV6INIT=yes
  IPV6_AUTOCONF=no
  IPV6ADDR=2405:200:370:236::12/64

Code:
 /etc/sysconfig/network-scripts ] cat route6-bond1 
   via 2405:200:370:237::1 dev bond1

Code:
  /etc/sysconfig/network-scripts ] cat ifcfg-bond1 
  DEVICE=bond1
  BONDING_MASTER=yes
  BONDING_OPTS="miimon=100 mode=1"
  BOOTPROTO=none
  ONBOOT=yes
  IPADDR=10.71.167.102
  NETMASK=255.255.255.240
  IPV6INIT=yes
  IPV6_AUTOCONF=no
  IPV6ADDR=2405:200:370:237::12/64
  IPV6_DEFAULTGW=2405:200:370:237::1


Moderator's Comments:
Mod Comment
Please wrap all code, files, input & output/errors in CODE tags.
It makes them easier to read and preserves spaces for indenting or fixed width data.

Last edited by rbatte1; 10-10-2017 at 06:54 AM.. Reason: Added CODE tags
 

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