So in a nutshell, lowering MTU on noisy lines can improve performance.
Lowering MTU on a perfectly good line will degrade performance.
If your line is really noisy then lowering the MTU will only delay the
inevitable by a few minutes.
At 03:00 PM 6/30/98 -0400, Jeff Woods wrote:
>Several of the magazine rags (PCWorld, etc) have been recommending users to
>drop their MTU's to 576 bytes for a significant speedup. I've tried this
>on a modem connection, and by george if it doesn't work. Should we
>consider dropping the NAS-side MTU on async connections to 576 as well, and
>if we did, what negative repercussions would there be?
>
>FWIW, Microsoft has made 576 the default MTU in Win98 now, too,
>acknowledging that it made a mistake in selecting 1500 for its Winsock....
>
>Comments?
>
>At 01:25 PM 6/30/98 -0500, you wrote:
>>From: Jorg B. [mailto:jorg_b@cwo.com]
>>Sent: Tuesday, June 30, 1998 12:46 PM
>>> Is there a way to restrict ISDN connections based on user names ?
>>> For example: User name tom is allowed to establish a ISDN
>>> connection but
>>> user name peter can only connect using a "non ISDN" modem.
>>> PM3 (PRI connected)
>>
>>In /etc/raddb/users (assuming /etc/passwd is used for authentication),
>>use something like this:
>>
>>AsyncUser Auth-Type = System, NAS-Port-Type = Async
>> Service-Type = Framed-User,
>> Framed-Protocol = PPP,
>> Framed-Address = 255.255.255.254,
>> Framed-Netmask = 255.255.255.255,
>> Framed-MTU = 1500
>>
>>64kISDNUser Auth-Type = System
>> Service-Type = Framed-User,
>> Framed-Protocol = PPP,
>> Framed-Address = 255.255.255.254,
>> Framed-Netmask = 255.255.255.255,
>> Framed-MTU = 1500
>> Port-Limit = 1
>>
>>128kISDNUser Auth-Type = System
>> Service-Type = Framed-User,
>> Framed-Protocol = PPP,
>> Framed-Address = 255.255.255.254,
>> Framed-Netmask = 255.255.255.255,
>> Framed-MTU = 1500
>> Port-Limit = 2
>>
>>Hope this helps...
>>
>>--Kevin
>>
>>Kevin Sawyer - President/CEO - sawyerk@apci.net
>>Applied Personal Computing, Inc. - APCiNet - http://www.apci.net
>>6001 Old Collinsville Road, Building #3, Fairview Heights, IL 62208
>>Office: (618) 632-7282 FAX: (618) 632-7287 Support: (618) 628-2Net
>>
>>
>>-
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