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Strange NAT entry with no protocol

Hi All,

Any ideas to why there might be some empty nat translations in my nat table. By this I mean a nat entry that shows up with no protocol defined and no outside local and outside global.

core2-cr-mel#sh ip nat trans | inc 172.16.75.139

Pro Inside global Inside local Outside local Outside global

--- 210.15.240.9 172.16.75.139 --- ---

tcp 210.15.240.9:5380 172.16.75.139:5380 61.137.191.125:80 61.137.191.125:80

Thanks.

Andy

3 REPLIES
Hall of Fame Super Silver

Re: Strange NAT entry with no protocol

Hello Andy,

the line should be there to represent a static NAT entry

like

--- --- --- 172.24.156.1 217.x.y.137

because there is a line like

ip nat outside source static 217.x.y.137 172.24.156.1

I can see this in a router of one of our extranets

It should be a sort of placeholder

Hope to help

Giuseppe

New Member

Re: Strange NAT entry with no protocol

Hi Giuseppe ,

That's the odd thing. It's not a static nat entry. I have not configured any static nat.

What I pasted is exactly how it appears in the nat table.

core2-cr-mel#sh ip nat trans

Pro Inside global Inside local Outside local Outside global

--- 210.15.240.9 172.16.75.139 --- ---

The first column is the Protocol field, so either TCP or UDP but it's blank (---). And the last two columns are the Outside local and Outside global and these are also blank.

Any ideas?

Thanks.

Andy

Hall of Fame Super Silver

Re: Strange NAT entry with no protocol

Hello Andy,

this is really strange.

no ideas at the moment

Hope to help

Giuseppe

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