Issue Description
After adjusted the firewall routing in a network, a web server did not fuctioned.
Handling Process
Checking the routing list, discovered that the adjusted routing is normal, but the transmition is failed.
to examinate FIB table, it is not finded the corresponded item in the FIB list, it may be the issued bug caused the route finally not to become effective.
[USG2200]disp ip rout
11:04:03 2012/12/13
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 10 Routes : 10
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 Static 60 0 RD 100.1.1.1 GigabitEthernet0/0/1
99.1.1.0/24 Direct 0 0 D 99.1.1.1 GigabitEthernet0/0/0
99.1.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
100.1.1.0/24 Direct 0 0 D 100.1.1.2 GigabitEthernet0/0/1
100.1.1.2/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
192.168.1.0/24 Direct 0 0 D 192.168.1.1 Vlanif1
192.168.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
200.1.1.0/24 Static 60 0 RD 99.1.1.2 GigabitEthernet0/0/0
[USG2200]disp fib
11:04:07 2012/12/13
Fib Flags: B - blackhole, D - dynamic, G - gateway, H - host, S - static
U - up
------------------------------------------------------------------------------
FIB Table:
Total number of Routes : 10
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
127.0.0.1/32 127.0.0.1 HU t[57] InLoop0 0x0
127.0.0.0/8 127.0.0.1 U t[57] InLoop0 0x0
192.168.1.1/32 127.0.0.1 HU t[125] InLoop0 0x0
192.168.1.0/24 192.168.1.1 U t[125] Vlanif1 0x0
99.1.1.1/32 127.0.0.1 HU t[94889] InLoop0 0x0
99.1.1.0/24 99.1.1.1 U t[94889] GE0/0/0 0x0
100.1.1.2/32 127.0.0.1 HU t[94952] InLoop0 0x0
100.1.1.0/24 100.1.1.2 U t[94952] GE0/0/1 0x0
0.0.0.0/0 100.1.1.1 GSU t[95514] GE0/0/1 0x0
[USG2200]
Deletes the route repeatedly, and redeploys the route, transfers the publication not to correspond the repeater item, this possibly involves the edition flaw, after restarts the equipment , the transmition is normal, and then the correspond item was find in the FIB.
Root Cause
After adjusting the route, the discontinuance of business generally speaking many concerns with the route that adjusts.
Suggestions
it is not only check the routing table but the FIB table in doing troubleshooting of transmit failed, generally it is ofen to neglect to inspection FIB infomation.