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PAT not translating, subinterfaces

stevek543
Level 1
Level 1

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
Level 1
Level 1

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!