multiple duplicate udp NAT entries
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01-29-2009 03:54 AM - edited 03-06-2019 03:44 AM
Dear all,
using a Cisco 878 with PAT I got following issue:
This is the situation: There is a location with a few IP-phones, which register to the Central Office via SIP 5060. After that they establish RTP sessions to the Central office. The C878 got one official IP adress, the LAN got a private range (192.168.200.x).
After a few minutes there exist multiple duplicate UDP Nat translations, so communication of the involved phones fail:
#sh ip nat trans
udp 92.60.223.30:5004 192.168.200.46:5004 92.60.208.97:10000 92.60.208.97:10000
udp 92.60.223.30:5004 192.168.200.46:5004 92.60.208.97:10056 92.60.208.97:10056
udp 92.60.223.30:5005 192.168.200.46:5005 92.60.208.97:10001 92.60.208.97:10001
udp 92.60.223.30:5005 192.168.200.46:5005 92.60.208.97:10057 92.60.208.97:10057
<config>
ip nat inside source list NatToExternal interface Dialer1 overload
ip access-list extended NatToExternal
permit ip 192.168.200.0 0.0.0.255 any
IOS is: c870-advipservicesk9-mz.124-15.T8.bin
How can I get around these duplicate NAT ?
Thanks in Advance,
Sascha
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02-04-2009 11:51 AM
This is bug CSCse97264. Two or more UDP NAT translations that relate to different requests may be assigned port numbers with the same inside global IP address.
