05-20-2019 06:32 AM
i have 3 routers connected as shown in figure.
I have given a command of PAT on r2.
ip nat pool pat 25.1.0.1 25.1.0.100 prefix-length 24
ip nat inside source list 2 pool pat overload
Standard IP access list 2
10 permit 1.1.1.0, wildcard bits 0.0.0.255
If I ping from R3 to R1. The return traffic get PATed from R2 and R3 does not accept the ping reply
But if I change it to NAT then the ping reply is accepted.
My first question is: In case of NAT I am pinging IP 1.1.1.1 from 3.3.3.3. The ping reply gets NATed from R2 with an IP 25.1.0.1 (i.e IP from pool). Router R3 still accepts the ping. So router does not router has to check the source IP of the reply as it should have expected the reply from 1.1.1.1.
Other thing is in case of PAT why is not working then.
I have referred https://community.cisco.com/t5/switching/can-t-ping-from-outside-to-inside-nat/td-p/3201182 and understood that PAT will not work. But my question is if NAT is working then PAT will not.
05-20-2019 06:42 AM
Hello,
post the full configurations of all three routers...
05-20-2019 06:52 AM
05-20-2019 07:12 AM
Hello,
I have labbed your setup in GNS3, I assume this is the configuration where PING traffic works. What do you have configured when it does NOT work ?
05-20-2019 10:02 PM
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