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Ron Maupin ♦
Ron Maupin ♦
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ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28 ip nat inside source list 1 pool NAT-Pool overload ip nat inside source list 100 pool NAT-Pool overload ip nat inside source static tcp 172.20.9.3 80 38.xxx.xxx.199 80 extendable ip nat inside source static tcp 172.20.9.3 443 38.xxx.xxx.199 443 extendable ip nat inside source static tcp 172.20.9.3 3478 38.xxx.xxx.199 3478 extendable ip nat inside source static tcp 172.20.9.3 5222 38.xxx.xxx.199 5222 extendable ip nat inside source static tcp 172.20.9.3 5349 38.xxx.xxx.199 5349 extendable ip nat inside source static udp 172.20.9.3 10000 38.xxx.xxx.199 10000 extendable

ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28
ip nat inside source list 1 pool NAT-Pool overload
ip nat inside source list 100 pool NAT-Pool overload
ip nat inside source static tcp 172.20.9.3 80 38.xxx.xxx.199 80 extendable
ip nat inside source static tcp 172.20.9.3 443 38.xxx.xxx.199 443 extendable
ip nat inside source static tcp 172.20.9.3 3478 38.xxx.xxx.199 3478 extendable
ip nat inside source static tcp 172.20.9.3 5222 38.xxx.xxx.199 5222 extendable
ip nat inside source static tcp 172.20.9.3 5349 38.xxx.xxx.199 5349 extendable
ip nat inside source static udp 172.20.9.3 10000 38.xxx.xxx.199 10000 extendable

Blockquote

similar static entry (38.xxx.xxx.207 -> 38.xxx.xxx.199) already exists

Blockquotesimilar static entry (38.xxx.xxx.207 -> 38.xxx.xxx.199) already exists

This is what my interface looks like; interface GigabitEthernet0/0 ip address 172.20.8.1 255.255.252.0 ip nat inside ip virtual-reassembly duplex full speed 1000 ! interface GigabitEthernet0/1 ip address 38.yyy.zzz.178 255.255.255.248 ip nat outside ip virtual-reassembly duplex full speed 1000like:

interface GigabitEthernet0/0
 ip address 172.20.8.1 255.255.252.0
 ip nat inside
 ip virtual-reassembly
 duplex full
 speed 1000
!
interface GigabitEthernet0/1
 ip address 38.yyy.zzz.178 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 duplex full
 speed 1000

ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28 ip nat inside source list 1 pool NAT-Pool overload ip nat inside source list 100 pool NAT-Pool overload ip nat inside source static tcp 172.20.9.3 80 38.xxx.xxx.199 80 extendable ip nat inside source static tcp 172.20.9.3 443 38.xxx.xxx.199 443 extendable ip nat inside source static tcp 172.20.9.3 3478 38.xxx.xxx.199 3478 extendable ip nat inside source static tcp 172.20.9.3 5222 38.xxx.xxx.199 5222 extendable ip nat inside source static tcp 172.20.9.3 5349 38.xxx.xxx.199 5349 extendable ip nat inside source static udp 172.20.9.3 10000 38.xxx.xxx.199 10000 extendable

Blockquote

similar static entry (38.xxx.xxx.207 -> 38.xxx.xxx.199) already exists

Blockquote

This is what my interface looks like; interface GigabitEthernet0/0 ip address 172.20.8.1 255.255.252.0 ip nat inside ip virtual-reassembly duplex full speed 1000 ! interface GigabitEthernet0/1 ip address 38.yyy.zzz.178 255.255.255.248 ip nat outside ip virtual-reassembly duplex full speed 1000

ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28
ip nat inside source list 1 pool NAT-Pool overload
ip nat inside source list 100 pool NAT-Pool overload
ip nat inside source static tcp 172.20.9.3 80 38.xxx.xxx.199 80 extendable
ip nat inside source static tcp 172.20.9.3 443 38.xxx.xxx.199 443 extendable
ip nat inside source static tcp 172.20.9.3 3478 38.xxx.xxx.199 3478 extendable
ip nat inside source static tcp 172.20.9.3 5222 38.xxx.xxx.199 5222 extendable
ip nat inside source static tcp 172.20.9.3 5349 38.xxx.xxx.199 5349 extendable
ip nat inside source static udp 172.20.9.3 10000 38.xxx.xxx.199 10000 extendable

similar static entry (38.xxx.xxx.207 -> 38.xxx.xxx.199) already exists

This is what my interface looks like:

interface GigabitEthernet0/0
 ip address 172.20.8.1 255.255.252.0
 ip nat inside
 ip virtual-reassembly
 duplex full
 speed 1000
!
interface GigabitEthernet0/1
 ip address 38.yyy.zzz.178 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 duplex full
 speed 1000
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Somedude007
Somedude007
  • 1

Cisco 2851 Static NAT Entry - Similar Static Entry Already Exists

Thank you in advance.

I have a few 2851 Cisco ISR. This is my NAT Pool config;

ip nat pool NAT-Pool 38.xxx.xxx.193 38.xxx.xxx.206 prefix-length 28 ip nat inside source list 1 pool NAT-Pool overload ip nat inside source list 100 pool NAT-Pool overload ip nat inside source static tcp 172.20.9.3 80 38.xxx.xxx.199 80 extendable ip nat inside source static tcp 172.20.9.3 443 38.xxx.xxx.199 443 extendable ip nat inside source static tcp 172.20.9.3 3478 38.xxx.xxx.199 3478 extendable ip nat inside source static tcp 172.20.9.3 5222 38.xxx.xxx.199 5222 extendable ip nat inside source static tcp 172.20.9.3 5349 38.xxx.xxx.199 5349 extendable ip nat inside source static udp 172.20.9.3 10000 38.xxx.xxx.199 10000 extendable

Say I want to add another udp port 10001 to the same IP addresses, I get

Blockquote

similar static entry (38.xxx.xxx.207 -> 38.xxx.xxx.199) already exists

Blockquote

This is what my interface looks like; interface GigabitEthernet0/0 ip address 172.20.8.1 255.255.252.0 ip nat inside ip virtual-reassembly duplex full speed 1000 ! interface GigabitEthernet0/1 ip address 38.yyy.zzz.178 255.255.255.248 ip nat outside ip virtual-reassembly duplex full speed 1000

I am running Layer 3 setup.

Now I can add the new NAT entry if the router is rebooted and I immediately add it once it is up. I originally thought that this was the hardware, however I have all 3 routers with identical configurations doing the same thing. Note IP assignment are different on each router.

Thoughts?