nanog mailing list archives

RE: IT security people sleep well


From: "Jason Frisvold" <friz () corp ptd net>
Date: Mon, 7 Jun 2004 22:52:43 -0400


-----Original Message-----
From: Valdis.Kletnieks () vt edu [mailto:Valdis.Kletnieks () vt edu] 
OK.. Say you can get it into the code train for 200K.  What 
do you do with all
those routers that have only 100K or 125K of space left in 
the flash (if that),
and the flash is NOT going to get any bigger without massive 
abuse of a
soldering iron because not all the needed address lines are 
brought out to the
flash chip (a fine tactic dating back decades - I remember 
seeing a 16K ROM
nailed to the top quarter of the 64K address space, and only 
14 address lines
brought to the chip - it was nailed to the top 16K by feeding 
A14 and A15 to an
AND gate which fed the 'Chip Select' pin...)

Agreed, but what are those routers used for these days?  We use those
routers for management (old 2511's) ...  Any existing 2500's in the core
network (yes, I'm ashamed to say some still exist) are ensured to have
the max memory they can get ...  Again, this is purely theoretical for
me as management here has not deemed it appropriate to deploy ssh ...

But, if ssh were added to all IOS's, it would greatly reduce the number
of routers that could *not* include SSH due to flash limitations...

I can say that in other networks that I consult for, I try to ensure ssh
is available, as well as acl's and other security techniques...  :)

Jaosn Frisvold
Penteledata


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