Re: A router bug?

H.J. Lu (hjl@lucon.org)
Sat, 30 Jan 1999 17:12:06 -0800 (PST)

>
> > from the remote site. For some reason, the response never comes.
> > Is that possible for the Linux gateway doesn't forward those bytes
> > sent to the remote site under certain conditions? What should I
> > look for?
>
> If the MTU of the two links is different you should look for outgoing
> frames through the router with no reply when the size of reply would be
> large. Thats a clear indication that the remote site has firewalls set up
> by overpaid underbrained morons from one of the many rich and clueless
> consulting firms who think blocking all icmp on a firewall is a valid
> thing to do.
>

I am not sure if it is the case:

1. I can access the web site in question on the Linux router.
2. Here is the slip interface on the router:

# ifconfig sl0
sl0 Link encap:VJ Serial Line IP
inet addr:209.249.10.145 P-t-P:209.249.10.10 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:576 Metric:1
RX packets:2182 errors:0 dropped:5 overruns:1190 frame:1
compressed:0
TX packets:2001 errors:0 dropped:0 overruns:1069 carrier:0
collisions:8 compressed:0

On the remote slip site:

# ifconfig sl0
sl0 Link encap:VJ Serial Line IP
inet addr:209.249.10.10 P-t-P:209.249.10.145 Mask:255.255.255.248
UP POINTOPOINT NOTRAILERS RUNNING NOARP MULTICAST MTU:576 Metric:1
RX packets:158898 errors:2049 dropped:0 compressed:0
TX packets:0 errors:0 dropped:0 compressed:284488

Everything seems to match. The only difference is I don't have
NOTRAILERS.

Thanks.

-- 
H.J. Lu (hjl@gnu.org)


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