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static routing issue no access to public internet

Posted on 2016-11-24
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Last Modified: 2017-01-14
static routing issue no access to public internet
We have 3 vlan's
vlan 1
vlan 12
vlan 13

interface NULL0

# configuration of 1 router vrrp
interface Vlan-interface12
 ip address 192.168.2.252 255.255.255.0
 vrrp vrid 12 virtual-ip 192.168.2.1
#
interface Vlan-interface13
 ip address 192.168.1.252 255.255.255.0
 vrrp vrid 13 virtual-ip 192.168.1.1
#

# gateway to internet
interface GigabitEthernet0/1
 port link-mode route
 ip address 103.103.103.2 255.255.255.0

#static route to internet
ip route-static 0.0.0.0 0.0.0.0 103.103.103.1

Routing Tables:
Destination/Mask    Proto  Pre  Cost         NextHop         Interface
0.0.0.0/0           Static 60   0            103.103.103.1   GE0/1
127.0.0.0/8         Direct 0    0            127.0.0.1       InLoop0
127.0.0.1/32        Direct 0    0            127.0.0.1       InLoop0
192.168.1.0/24      Direct 0    0            192.168.1.252   Vlan13
192.168.1.1/32      Direct 1    0            127.0.0.1       InLoop0
192.168.1.252/32    Direct 0    0            127.0.0.1       InLoop0
192.168.2.0/24      Direct 0    0            192.168.2.252   Vlan12
192.168.2.1/32      Direct 1    0            127.0.0.1       InLoop0
192.168.2.252/32    Direct 0    0            127.0.0.1       InLoop0

Computer
Ip : 192.168.2.10
Mask : 255.255.255.0
Gateway : 192.168.2.1

Ping to 192.168.2.1     is ok            gateway
ping to 192.168.1.1     is ok            gateway
ping to 192.168.1.10      is ok            computer in network
ping to 103.103.103.2      is ok            public ip router
ping to 103.103.103.1      no response      public gateway
ping to 8.8.8.8            no response      public internet
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Question by:manuverhaegen
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7 Comments
 
LVL 31

Expert Comment

by:Predrag
ID: 41900771
Did you check your NAT configuration?
If not natted, private IP address space is dropped at ISP.
1
 
LVL 2

Author Comment

by:manuverhaegen
ID: 41900775
Hi,

Nat from external to internal work perfect
0
 
LVL 31

Accepted Solution

by:
Predrag earned 2000 total points
ID: 41900776
Most likely NAT is problem. Double check it. Internal routing works properly.
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LVL 2

Author Comment

by:manuverhaegen
ID: 41900779
i try to ping to external a receive no reply
0
 
LVL 31

Expert Comment

by:Predrag
ID: 41900799
Until you try to ping ISP router it is OK.
My guess is
103.103.103.2 is your router
103.103.103.1 is ISP device
Basically - traffic from ISP router drop your traffic (not natted) or forwarding traffic in wrong direction (ISP's router do not point to your router as next hop to reach netted traffic).
Nat from external to internal work perfect
If you can ping ISP from router directly connected to ISP 99% chance is that NAT is the root cause. From the statement that external NAT works OK most likely that is the case.
1
 
LVL 2

Author Closing Comment

by:manuverhaegen
ID: 41900802
On the public interface i forget :
nat outbound
1
 
LVL 31

Expert Comment

by:Predrag
ID: 41900804
It happens. ;)
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