can ping, can't download through firewall
garry at ascii-turf.net
Thu Dec 4 06:34:31 PST 2003
i'm a reasonably experienced linux/bsd user - i've installed a few boxes in my time and usually with a good level of success. but this time i'm stumped.
i'm trying to set up a freebsd gateway to share my cable modem connection.
from the gateway itself i can ping the world, from the attached clients i can ping the world, i can even do dns lookups. doing:
curl --head http://www.website.com
gives me a good-looking header and everything, but if i do
no joy. i get:
HTTP request sent; waiting for response.
and it stops there. this is true from both the clients and the gateway itself. i just can't download anything for all the pings in the world.
my current set up is
-- kernel config:
which are both straight out of the handbook.
-- ipfw -a list
00050 1844 130026 divert 8668 ip from any to any via rl0
00100 96 11166 allow ip from any to any via lo0
00200 0 0 deny ip from any to 127.0.0.0/8
00300 0 0 deny ip from 127.0.0.0/8 to any
65000 2481 200907 allow ip from any to any
65535 0 0 allow ip from any to any
ethernet cards - a pair of 8139's - rl0 external, rl1 internal. as far as i can tell they work fine.
i've tried the same thing using ipfilter and ipnat instead of natd and ipfw - with the same results.
i've noticed that if i turn on the firewall my pings to the isp's router are much much less reliable, sometimes losing 30%+ of the packets but generally degraded compared to the setup with no firewall enabled.
the firewall stats show that everything is passing ok.
i really don't know what's going on. unfortunately my web searches have turned up nothing similar.
does anyone have any ideas/comments/suggestions/experience of the same? is it the network cards? pings from the client machine when connected directly work perfectly but from the gateway are at best a little dodgy - losing 15% of the packets.
any help greatly appreciated.
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