OK a weird one, but bear with me. I've got a proposal to slam to 10.x.x.x networks together with a IOS NAT gateway, and the site at the other side wants me to build a config that literally has 4,000 static NAT's.
Can anyone give me any empirical reasons why a 2811 wouldn't be able to do this -- other than it just sounds totally insane to even suggest it.
There is no default limit of NAT entries on IOS. Each nat entry takes 160 bytes of DRAM memory so theorotically you can have as many NAT entries as your free DRAM memory would allow! So if you have a lot of memory spare ( you need aournd 640k spare for 4000 NAT entries), you CAN do that on your router....not sure if that is good news or bad news for you though :)
Remember that NAT is still done in software on those routers though.
Note: You can limit the max nat entries by "ip nat translation max-entries " command.
BUT, wouldn't there also be a NVRAM (config memory) concern? Aside from DRAM and CPU to execute the commands, it seems to me you also need about 50 bytes for each "ip nat inside source static" line in the config. If you do that math, that's 200KB of non-volatile config memory, and I don't think a 2811 has that much to spare. I found a 2851 "show ver" that listed 239KB, so I figure a 2811 could only be worse.
Of course maybe I DON'T want to know if my thinking is wrong there. I just LOVE trying to come up with reasons why something that's just intuitively stupid is actually somehow physically impossible...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.