6to4, stf and shoebox NAT routers

Hajimu UMEMOTO ume at freebsd.org
Sat Mar 12 01:48:16 PST 2005


>>>>> On Fri, 11 Mar 2005 23:24:52 -0800
>>>>> Nick Sayer <nsayer at kfu.com> said:

nsayer> Well, I'm screwed.

nsayer> I set up the Linksys router so that the FreeBSD machine is the "DMZ" 
nsayer> host on the inside. Sending 6to4 to the router's outside address 
nsayer> results in tcpdump showing these on the inside:

nsayer> 22:09:36.138924 [linksys mac address] > ff:ff:ff:ff:ff:ff, ethertype 
nsayer> ARP (0x0806), length 60: arp who-has [linksys outside ip] tell [linksys 
nsayer> inside ip]

nsayer> Which, quite frankly, is laughable. If that weren't enough, the packets 
nsayer> come out of the linksys router with the source IP address being from 
nsayer> the inside (meaning, it didn't get NATted). Humph.

nsayer> So it appears that for now, I will have to keep a 2nd interface active 
nsayer> on this box solely for the purpose of doing IPv6. What a nightmare.

It seems your Linksys box simply forward packets without translating
destination address to your 6to4 box.
I don't know actually what DMZ concept of Linksys is.  However, you
may need some additional setting into your Linksys box.  Or, when you
just set global addres of your Linksys box to your 6to4 box, you
may be able to use 6to4 without my patch.


Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume at mahoroba.org  ume@{,jp.}FreeBSD.org

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