lizhen@SILVER.UCS.INDIANA.EDU (Zhen Li) (05/04/91)
I am trying to hook up my pc at home to the campus network
through dialup line and using another pc at my office as a
gateway. I installed net.exe and configureation files on
both of the pc's. But now when I tried to telnet from home
I got a lot of checksum errors on the gateway side(my office).
By tracing the serial interface, I found the gateway side
droped one byte in each received IP packet.
Following are the tracing message on both sides:
-----------home-----------------------
serial line IP: len: 44
IP: len 44 129.79.17.1->129.79.1.174 ihl 20 ttl 99 prot TCP
TCP: 1024->23 Seq x21e7b000 SYB End 2048 MSS 1024
----------office---------------------
serial line IP: len 43
IP: len 44 129.79.1.129->79.1.174.4 ihl 20 ttl 99 checksum error(38263)port TCP
TCP: 0->5921 Seq xe7b0000 PSH Wnd 166 Data 3 CHECKSUM ERROR(60453)prot TCP
------------------------------------
Did anybody have the similar problem before? Any comment and suggestion
are appreciated.
Next are my configuration files on the both side:
========================================================================
autoexec.net (client)
========================================================================
hostname net-client.ucs.indiana.edu
ip address [129.79.17.1]
#
attach asy 0x3f8 4 slip sl0 8092 576 9600
ifconf sl0 ipaddress [129.79.17.1]
ifconf sl0 broad [129.79.17.255]
ifconf sl0 netmask 0xffffff00
#
route add [129.79.17.0]/24 sl0
route add default sl0 [129.79.17.254]
#
ip ttl 16
tcp mss 1024
tcp window 2048
#
start ftp
start echo
start discard
start telnet
start finger
#
=======================================================================
autoexec.net (gateway)
=======================================================================
#
hostname sideways.ucs.indiana.edu
#
attach packet 0x60 pk0 4096 1500
ifconfig pk0 ipaddress 129.79.16.68
ifconfig pk0 netmask 0xffffff00
ifconfig pk0 broadcast 129.79.16.255
#
attach asy 0x3f8 4 slip sl0 8092 576 9600
ifconfig sl0 ipaddress 129.79.17.254
ifconfig sl0 netmask 0xffffff00
ifconfig sl0 broadcast 129.79.17.255
#
route add 129.79.17.1 sl0
route add [129.79.17.0]/24 sl0
route add default pk0 [129.79.16.174]
#
ip ttl 16
tcp window 2048
tcp mss 1024
#
domain addserver 129.79.1.9
domain suffix ucs.indiana.edu
start echo
start discard
start telnet
start ftp
start finger
#
#The End
#
====================================================================
Thanks,
Zhen Li