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To: "'cipe-l,AT,inka,DOT,de'" <cipe-l,AT,inka,DOT,de>
Subject: UDP: bad checksum messages..
From: Doug Johnson <doug.johnson,AT,vifanusa,DOT,com>
Date: Sat, 28 Jun 2003 21:55:48 -0400

I am using CIPE-Win32 v2.0-pre15 on a Win2k machine with no problems in
usage (after the gracious help from many on the list).  I do however see
some messages on the Linux server that are unusual. In the /var/log/messages
file I see the following:

Jun 28 21:03:32 linus kernel: NET: 3 messages suppressed.
Jun 28 21:10:54 linus kernel: NET: 1 messages suppressed.
Jun 28 21:22:47 linus kernel: NET: 1 messages suppressed.
Jun 28 21:28:04 linus kernel: NET: 1 messages suppressed.

Understanding the kernel suppresses like messages sent within 5 seconds I
found the culprit in dmesg:

cipcb0: cipe_sendmsg
cipcb0: cipe_recvmsg
UDP: bad checksum. From 192.168.1.200:62516 to 10.1.0.3:62516 ulen 25
UDP: bad checksum. From 192.168.1.200:62516 to 10.1.0.3:62516 ulen 25
UDP: bad checksum. From 192.168.1.200:62516 to 10.1.0.3:62516 ulen 25
UDP: bad checksum. From 192.168.1.200:62516 to 10.1.0.3:62516 ulen 25

There doesn't seem to be anything unusual in a netstat -a. I am however
running two cipcb adpaters (cipcb0 and cipcb1) on the Linux server at this
time. cicpb0 is for LAN to LAN connectivity between a linux server and a
linux client (which works fine) and cipcb1 is a win2k machine connected to
the linux server (which so far is working fine). 

My question is what am I seeing with the bad checksum and how can I correct
it?

(other configurations below if needed)

###############  WIN32 CLIENT  ##################

In the adapter settings of the Win2k box:
IP Address: 10.1.0.4
Subnet Mask: 255.255.255.0
Default Gateway: (blank)
 
DNS Server entries are both blank as well.
 
In the CIPE Peer setting I have the following info:
Local IP Addres: 0.0.0.0 Port 6850 
Peer IP Address: 66.43.188.40 Port 6850
Local PTP Address:10.1.0.4
Remote PTP Address: 10.1.0.3 
Status Enabled: (checked)
Static Key (hidden)
Cipher: Blowfish
Timeout seconds: 600

#################  LINUX SERVER  ##################

The CIPE server 
options.cipcb0 file:
 
dynip
cttl 64
maxerr -1
ptpaddr 10.1.0.2
ipaddr 10.1.0.1
me vpn.vifanusa.com:6849
peer 0.0.0.0
key (hidden)

ifcfg-cipcb0 file:

USERCTL=no
PEERDNS=no
TYPE=CIPE
DEVICE=cipcb0
ONBOOT=yes
IPADDR=10.1.0.1
MYPORT=6849
PTPADDR=10.1.0.2 
 
options.cipcb1 file:

dynip
cttl 64
maxerr -1
ptpaddr 10.1.0.4
ipaddr 10.1.0.3
me vpn.vifanusa.com:6850
peer 0.0.0.0
key (hidden)

ifcfg-cipcb1 file:

USERCTL=no
PEERDNS=no
TYPE=CIPE
DEVICE=cipcb1
ONBOOT=yes
IPADDR=10.1.0.3
MYPORT=6850
PTPADDR=10.1.0.4

##########  REMOTE LAN LINUX CLIENT ##########

options.cipcb0 file:

cttl 64
maxerr -1
dynip
ping 20
ipaddr 10.1.0.2
ptpaddr 10.1.0.1
me 0.0.0.0
peer vpn.vifanusa.com:6849
key (hidden)

ifcfg-cipcb0 file:

DEVICE=cipcb0
ONBOOT=yes
USERCTL=no
MYPORT=6849
PEER=vpn.vifanusa.com:6849
PTPADDR=10.1.0.1
IPADDR=10.1.0.2

#################### END ##############################

Thanks much in advance..
Doug 


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