Date: 29 May 2002 17:43:14 -0700 From: Jon Noack <noackjr@compgeek.com> To: freebsd-ipfw@freebsd.org Subject: peer-to-peer asymmetric simulation Message-ID: <20020530004314.3217.cpmta@c015.snv.cp.net>
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I'm trying to simulate a peer-to-peer network of 8 clients connected via asymmetric links using dummynet. I have it up and running using a machine with 8 network interfaces running as a bridge. The only issue is that (as I've found reading older posts) when running in a bridge packets are only passed through ipfw once. This obviously prevents me from limiting both directions of the links.
Basic config for 8 56Kbit/s modem clients:
#Upstream
pipe 1 config mask src-ip 0x000000ff bw 32Kbit/s delay 100ms queue 4Kbytes
add pipe 1 ip from any to any out
#Downstream
pipe 2 config mask dst-ip 0x000000ff bw 48Kbit/s delay 100ms queue 4Kbytes
add pipe 2 ip from any to any in
First of all, is this even correct (not sure about whether in and out are used correctly)? Second, I've seen that the following patch was proposed:
it might be as simple as changing one line in bridge.c
if (ip_fw_chk_ptr && bdg_ipfw != 0 && src != NULL) {
struct ip *ip ;
int i;
- if (rule != NULL) /* dummynet packet, already partially processed */
+ if (rule != NULL && fw_one_pass)
goto forward; /* HACK! I should obey the fw_one_pass */
but i never had a chance to test it.
Has anyone used this?
If this doesn't work, how should I modify my setup to make this work (i.e. use router instead of bridge? settings necessary?)?
Thanks,
Jon Noack
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