root@wotk.UUCP (Superuser) (07/17/90)
Does anyone know how to enable UDP checksums on a Sun 360.
Thanks.
Nick Hennenfent
Computone Products
1100 Northmeadow Parkway
Suite 150
Roswell, GA 30076
Voice 404 475-2725 FAX 404 343-9735 email ...!uunet!wotk!{root,nickh}beau@ultra.com (Beau James {Manager - SW Development - Ultra Networks}) (07/17/90)
In <5@wotk.UUCP> root@wotk.UUCP (Superuser) writes: >Does anyone know how to enable UDP checksums on a Sun 360. # adb -k /vmunix /dev/mem ... udp_cksum/W 1 ; Enables UDP checksums on the running kernel udp_cksum?W 1 ; Enables whenever this kernel is booted UDP checksums must be enabled on both sending and receiving machines before the software will compute and verify the checksum. Beau James beau@Ultra.COM Ultra Network Technologies {sun,ames}!ultra.com!beau -- Beau James beau@Ultra.COM Ultra Network Technologies {sun,ames}!ultra.com!beau
stevens@hsi.UUCP (Richard Stevens) (07/17/90)
In article <1990Jul17.003242.1556@ultra.com> beau@ultra.com (Beau James writes: > >UDP checksums must be enabled on both sending and receiving >machines before the software will compute and verify the >checksum. Newer systems should start conforming to the Host Requirements RFC (1122), meaning the receiver has to honor a checksum that was set by the sender: 4.1.3.4 UDP Checksums A host MUST implement the facility to generate and validate UDP checksums. An application MAY optionally be able to control whether a UDP checksum will be generated, but it MUST default to checksumming on. If a UDP datagram is received with a checksum that is non- zero and invalid, UDP MUST silently discard the datagram. An application MAY optionally be able to control whether UDP datagrams without checksums should be discarded or passed to the application. /Richard Stevens
barmar@think.com (Barry Margolin) (07/19/90)
In article <1812@hsi86.hsi.UUCP> stevens@hsi.com (Richard Stevens) writes: >In article <1990Jul17.003242.1556@ultra.com> beau@ultra.com (Beau James writes: >>UDP checksums must be enabled on both sending and receiving >Newer systems should start conforming to the Host Requirements RFC (1122), >meaning the receiver has to honor a checksum that was set by the sender: The question was specifically about enabling checksums in current BSD systems, in which case the caveat is correct. Is this bug fixed in 4.4bsd? Also, if the systems were conforming to the HR RFC it wouldn't be necessary to turn on UDP checksums. I believe the RFC also specifies that they MUST be enabled by default, and SHOULD provide the ability for the application or system administrator to disable them. -- Barry Margolin, Thinking Machines Corp. barmar@think.com {uunet,harvard}!think!barmar
hwajin@daahoud.wrs.com (Hwa Jin Bae) (07/20/90)
beau@ultra.com (Beau James {Manager - SW Development - Ultra Networks}) writes: >In <5@wotk.UUCP> root@wotk.UUCP (Superuser) writes: >>Does anyone know how to enable UDP checksums on a Sun 360. > # adb -k /vmunix /dev/mem > ... > udp_cksum/W 1 ; Enables UDP checksums on the running kernel > udp_cksum?W 1 ; Enables whenever this kernel is booted udpcksum not udp_cksum hwajin@daahoud.wrs.com
earle@POSEUR.JPL.NASA.GOV (Greg Earle - Sun JPL on-site Software Support) (07/22/90)
In comp.protocols.tcp-ip article <1990Jul17.003242.1556@ultra.com> you write: >In <5@wotk.UUCP> root@wotk.UUCP (Superuser) writes: >>Does anyone know how to enable UDP checksums on a Sun 360. > > # adb -k /vmunix /dev/mem > ... > udp_cksum/W 1 ; Enables UDP checksums on the running kernel > udp_cksum?W 1 ; Enables whenever this kernel is booted Careful Beau. This is true for SunOS 4.1, but for SunOS 4.0.3 and earlier SunOS releases, the variable is "udpcksum" (no helpful underscore (^: ) Also, you need to say "adb -w -k /vmunix /dev/mem" or else your attempts to write the new values will be somewhat futile ... (^: -- -- Greg Earle | "This is Kraft. It uses a blue box. Sun Microsystems, Inc. | This is Stouffer's. It uses red. earle@poseur.JPL.NASA.GOV | The choice is yours." earle@Sun.COM | Pretty damn convincing argument, eh?