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Re: (ASCEND) Serious performance problems with Netbios and MAX4000

Hello ,
we had same sort of problems.
Try to filter the windows netbios udp ports 137,138,139 on the 255 address of the network from the dialin ip pools.
When a windows PC takes an ip from a max, the netmask ist set to 255.255.255.0 .
So if that PC tries to "logon to network" it send the udp pakets to a.b.c.255, where a.b.c.x is the address of the ip pool.
Thats sometimes had caused very slow behaviour on a max 4000 of ours.
regards,

G.Glawe
SGH germany
Phone : germany -5121-76 46 18      
Fax   : germany -5121-76 46 10     
E-Mail: glawe@sgh-net.de
-----Ursprüngliche Nachricht-----
Von: Winfried Haug <haug@seicom.net>
An: ascend-users@bungi.com <ascend-users@bungi.com>
Datum: Donnerstag, 27. August 1998 10:27
Betreff: (ASCEND) Serious performance problems with Netbios and MAX4000


>Hello.
>
>last week we noticed raising TTLs on the local (!) Ethernet to one
>of our MAX4000 routers.
>We normally had  under 10ms and it raised to 2000-4000 (!) ms for
>a few minutes. We changed the hardware but the effect did not disappear.
>
>Even on the console port i had to wait 4-5 seconds (!) to move from one
>window to the next one in the configuration screen.
>
>
>Trafmon on my Freebsd systems noticed one (!) User to send huge amount
>of netbios packets to the broadcast Adress of our IP Pool.
>
>e.G we assign 192.168.10.X for dialup users, this user sends netbios
>packets to 192.168.10.255.
>The user had a ISDN connection and he has sent with 6500cps.
>
>What can be done with this effect ? Is there a option to discard netbois
>packets ?
>
>Winfried
>
>PS: pleae dont tell me to buy the firewall hash code. Just to filter
>    a few packets, i am not willig to give out 3000$ :_)
>
>
>-- 
>
>Winfried Haug        * Geschaeftsfuehrer * eMail: wh@seicom.net
>Laiblinsplatz 12     * 72793 Pfullingen  * tel. +49 7121 9770 0 
>Hauptstaetterstr. 66 * 70178 Stuttgart   * fax. +49 7121 9770 19
>
>------->> seicom.NET - making information available <<-------
>
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