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PAT not translating, subinterfaces

stevek543
Community Member

Hello,

I've attached a screenshot from my topology in GNS3.

So, my problem is that PAT is not translating - shows nothing in the statistic or translations.

I want connectivity between PC1 (192.168.100.1 - VLAN10) and the BORDER-RA (1.1.1.2). Thats why I used PAT.

You can find my config of R1 and BORDER-RA attached.

On R1 i have HRSP (with R1 being primary with 192.168.100.254 on g0/0.10) together with R2 which you cant see but is not important. A default route to BORDER-RA (1.1.1.2), and a PAT config which allows traffic from VL10 and VL20 (192.168.100.0 and 192.168.200.0). SubIF g0/0.10 and .20 are configured with ip nat inside and g0/2 with ip nat outside. I doubt that the config of BORDER-RA is relevant, but I still uploaded it so maybe there is something wrong... 

I captured traffic between both routers with Wireshark and when I ping from PC1 to 1.1.1.2, it shows only ICMP-Request with the source address 192.168.100.1 - which should not happen. THat means that traffic doesnt even pass the PAT-process, it goes straigt to the default route. I have no idea what's wrong I even rebuild the topology in Packet Tracer but there it works without problems.

Maybe you guys can help me.

24 Replies 24

stevek543
Community Member

still not working

subinterface issue.png

ok, capture the traffic before enter the R1, 
do you see the frame tag with VLAN-ID 10 ?? 
share the wireshark frame 

yes, vlanID 10

debug ip nat translations

do this in R1 and share any output 

"debug ip nat translations" command not possible...

i tried "debug ip nat" for everything... but still nothing

 ip access-group 150 in 

can you remove this and check again. 

still no...

maybe its the image? 

sure It can, I use stable image c7200.
but still L2 SW image have many issue in GNS3. 
what I suspect is SW-Router trunk is not work as we want 
so try change router image

hmm.. weird i will talk with my teacher and i will tell you if he finds something different maybe.. thanks a lot, i will inform you!