IP MASQ : TCP/UDP checksum errors

IP MASQ : TCP/UDP checksum errors

Post by Ro » Sat, 17 Apr 1999 04:00:00



Hi all

Ive been using ip mascarading for over a year now, and it has never
given me any troubles at all with 0 maintainance and everything.

But just recently, ive been getting these messages in the dmesg
command output

MASQ: failed TCP/UDP checksum from 207.149.188.194!
MASQ: failed TCP/UDP checksum from 207.149.188.194!
MASQ: failed TCP/UDP checksum from 207.136.66.70!

Its not just these addresses, but lots of others too.

I only started to notice this because i play ultima online a lot, and
i seem to be losing my connection a fair bit (ussually in the middle
of a battle!), which is very frustrating.

Does anyone know what could be causing this error.  I will supply any
more info if it is required.  Im not sure if its to do with my serial
port or not, but here setserial output (for a 56k modem)


/dev/modem, Line 3, UART: 16550A, Port: 0x02e8, IRQ: 3
        Baud_base: 115200, close_delay: 50, divisor: 0
        closing_wait: 3000, closing_wait2: infinte
        Flags: spd_vhi

Please help me, im fed up of alomost dying in UO all the time ! :)

Thanks in advance


 
 
 

1. IP Masq. failed TCP/UDP checksums

Fellow Linux users:

Happily running a tiny two comp. network with IP Masq.  Everything works
fine, except that when the other machine uses the web, through IP Masq,
I get a bunch of errors in the syslog:

----------------------------------
Apr 13 17:47:29 gandalf kernel: MASQ: failed TCP/UDP checksum from 206.28.99.10!
Apr 13 17:47:29 gandalf kernel: MASQ: failed TCP/UDP checksum from 206.28.99.10!
Apr 13 17:47:40 gandalf kernel: MASQ: failed TCP/UDP checksum from 152.163.200.130!
Apr 13 17:48:17 gandalf last message repeated 3 times
Apr 13 17:48:40 gandalf last message repeated 6 times        
----------------------------
The strange thing, is there is not any noticible slowdown at all from the
other machine.  Everything seems fine if you ignore the syslog :)

Question:  Is this normal?  Did I make some horribly mistake in configuring
IP Masq?

- James Unger

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