Trying to find the highest possible MTU

Hello,
I try to find out, wich is the highest possible MTU. So I send a PING -L XXXX -F to the Pix outside, from outside. XXXX is standing for the bytes.
PING xxx.xxx.xxx.xxx -L 992 (and lower) -F
I got a reply
PING xxx.xxx.xxx.xxx -L 993 (up to1472) -F
the ping timed out
PING xxx.xxx.xxx.xxx -L 1473 (and higher) -F
Fragmentation is needed
I don't understand, why it timed out between 993 an 1472.
If i try the same to a router (same internet connection), the ping works up to 1472, with no time out. Upeer 1472 I get the fragmentation message.
Have enyone an answer?
Thomas

My problem occurs also without any encryption. I'm connected to the internet and send a ping to the outside interface of the PIX. First a thought it is a problem with the router from the ISP, but we have also a CISCO 1605 connected to the same ISP router and there the ping work realy fine until 1472 bytes the I get the message fragmentition needed.
If I'm connected via the VPN Client 3.51 and send a ping to inside, I get the same results, but additional on the PIX, if debug ipsec is on, a message like this: IPSEC(ipsec_cipher_handler): ERR: bad pkt 10.1.80.3->10.1.1.1
I searched in the errordecoder from Cisco, but there are no results.
By the way, the pre-fragmentation is by default on and I didn't switch it off. It occurs not in IPSEC transfermode, which I'm using.

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