In static route handling, one corner case is ignored. That is 2 machines are directly connected while IPs configured are in the different subnet. Say the IP of NIC1 on machine A is 192.168.10.1/24, the IP of NIC2 on machine B is 192.168.20.1/24. Then on machine A, a route need be specified: 192.168.20.0/24 dev NIC1 On machine B: 192.168.10.0/24 dev NIC2 Without these routes connection from NIC1 to NIC2 can't be setup. So if in machine A the dump target is set as machine B, route "192.168.20.0/24 dev NIC1" has to be added in kdump kernel. But this is ignored in previous handling since we use below patch to find all routes: /sbin/ip route show | grep -v default | grep "^[[:digit:]].*via.* $_netdev " Now in this patch use "/sbin/ip route get to $_target" to get the exact route to the target. sh> ip route get to 192.168.20.2 192.168.20.2 via 192.168.10.2 dev ens10 src 192.168.10.1 192.168.10.1 -> 192.168.20.2 -> 192.168.20.1 -> 192.168.20.2 or sh> ip route get to 192.168.20.2 192.168.20.2 dev ens10 src 192.168.10.1 192.168.10.1 -> 192.168.20.2 And write the static route to config file only if static ip address configured on this network interface. --- dracut-module-setup.sh | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index 8fa59ca..fda50cd 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -75,15 +75,24 @@ kdump_static_ip() { local _ipaddr=$(ip addr show dev $_netdev permanent | \ awk "/ $_srcaddr\/.* $_netdev\$/{print \$2}") if [ -n "$_ipaddr" ]; then - _netmask=$(ipcalc -m $_ipaddr | cut -d'=' -f2) - _gateway=$(ip route list dev $_netdev | awk '/^default /{print $3}') - echo -n "${_srcaddr}::${_gateway}:${_netmask}::" + _netmask=$(ipcalc -m $_ipaddr | cut -d'=' -f2) + _gateway=$(ip route list dev $_netdev | awk '/^default /{print $3}') + echo -n "${_srcaddr}::${_gateway}:${_netmask}::" + + + local _route + _route=`/sbin/ip route get to $_target 2>&1` + if [ -n "`echo $_route | grep via`" ] + then + # route going to a different subnet via a router + echo $_route | awk '{printf("rd.route=%s:%s:%s\n", $1, $3, $5)}' \ + >> ${initdir}/etc/cmdline.d/45route-static.conf + else + # route going to a different subnet though directly connected + echo $_route | awk '{printf("rd.route=%s:%s:%s\n", $1, $3)}' \ + >> ${initdir}/etc/cmdline.d/45route-static.conf + fi fi - - /sbin/ip route show | grep -v default | grep "^[[:digit:]].*via.* $_netdev " |\ - while read line; do - echo $line | awk '{printf("rd.route=%s:%s:%s\n", $1, $3, $5)}' - done >> ${initdir}/etc/cmdline.d/45route-static.conf } kdump_get_mac_addr() { -- 1.9.0