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Diffstat (limited to 'usr.sbin/faithd/README')
| -rw-r--r-- | usr.sbin/faithd/README | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/usr.sbin/faithd/README b/usr.sbin/faithd/README index 2228265581d..1e308fba043 100644 --- a/usr.sbin/faithd/README +++ b/usr.sbin/faithd/README @@ -1,8 +1,8 @@ Configuring FAITH IPv6-to-IPv4 TCP relay Kazu Yamamoto and Jun-ichiro itojun Hagino -$OpenBSD: README,v 1.6 2000/07/02 09:21:50 itojun Exp $ -$KAME: README,v 1.5 2000/07/02 08:50:50 itojun Exp $ +$OpenBSD: README,v 1.7 2000/09/16 10:33:43 itojun Exp $ +$KAME: README,v 1.6 2000/07/06 13:43:33 itojun Exp $ Introduction @@ -28,12 +28,12 @@ invoked per each TCP services (TCP port number). clients IPv6 node "src" | You will have to allocate an IPv6 address prefix to map IPv4 addresses into. -The following description uses 3ffe:0501:1234:ffff:: as example. +The following description uses 3ffe:0501:ffff:0000:: as example. Please use a prefix which belongs to your site. FAITH will make it possible to make a IPv6 TCP connection From IPv6 node "src", toward IPv4 node "dest", by specifying FAITH-mapped address -3ffe:0501:1234:ffff::123.4.5.6 -(which is, 3ffe:0501:1234:ffff:0000:0000:7b04:0506). +3ffe:0501:ffff:0000::123.4.5.6 +(which is, 3ffe:0501:ffff:0000:0000:0000:7b04:0506). The address mapping can be performed by hand:-), by speical nameserver on the network, or by special resolver on the source node. @@ -42,7 +42,7 @@ Setup ===== The following example assumes: -- You have assigned 3ffe:0501:1234:ffff:: as FAITH adderss prefix. +- You have assigned 3ffe:0501:ffff:0000:: as FAITH adderss prefix. - You are willing to provide IPv6-to IPv4 TCP relay for telnet. <<On the translating router on which faithd runs>> @@ -58,8 +58,8 @@ The following example assumes: (3) Route packets toward FAITH prefix into "faith0" interface. # ifconfig faith0 up - # route add -inet6 3ffe:0501:1234:ffff:: -prefixlen 64 \ - fe80::xxxx:yyyy:zzzz:wwww%faith0 + # route add -inet6 3ffe:0501:ffff:0000:: -prefixlen 64 ::1 + # route change -inet6 3ffe:0501:ffff:0000:: -prefixlen 64 -ifp faith0 (4) Execute "faithd" by root as follows: @@ -79,6 +79,9 @@ The following example assumes: # faithd ftpd /usr/libexec/ftpd ftpd -l # faithd sshd +If inetd(8) on your platform have special support for faithd, it is possible +to setup faithd services via inetd(8). Consult manpage for details. + <<Routing>> @@ -96,7 +99,7 @@ There are two ways to translate IPv4 address to IPv6 address: (5.b) Add an entry into /etc/hosts so that you can resolve hostname into faked IPv6 addrss. For example, add the following line for www.netbsd.org: - 3ffe:0501:1234:ffff::140.160.140.252 www.netbsd.org + 3ffe:0501:ffff:0000::140.160.140.252 www.netbsd.org <<On the translating router on which faithd runs.>> @@ -108,27 +111,40 @@ in "/var/log/daemon". daemon.* /var/log/daemon +Access control +============== + +Since faithd implements TCP relaying service, it is critical to implement +proper access control to cope with malicious use. Bad guy may try to +use your relay router to circumvent access controls, or may try to +abuse your network (like sending SPAMs from IPv4 address that belong to you). +Install IPv6 packet filter directives that would reject traffic from +unwanted source. If you are using inetd-based setup, you may be able to +use access control mechanisms in inetd. + + Advanced configuration ====================== If you would like to restrict IPv4 destination for translation, you may want to do the following: - # route add -inet6 3ffe:0501:1234:ffff::123.0.0.0 -prefixlen 104 \ - -interface faith0 + # route add -inet6 3ffe:0501:ffff:0000::123.0.0.0 -prefixlen 104 ::1 + # route change -inet6 3ffe:0501:ffff:0000::123.0.0.0 -prefixlen 104 \ + -ifp faith0 By this way, you can restrict IPv4 destination to 123.0.0.0/8. -You may also want to reject packets toward 3ffe:0501:1234:ffff::/64 which -is not in 3ffe:0501:1234:ffff::123.0.0.0/104. This will be left as excerside +You may also want to reject packets toward 3ffe:0501:ffff:0000::/64 which +is not in 3ffe:0501:ffff:0000::123.0.0.0/104. This will be left as excerside for the reader. By doing this, you will be able to provide your IPv4 web server to outside IPv6 customers, without risks of unwanted open relays. - [[[[ IPv6 network outside ]]]] | + [[[[ IPv6 network outside ]]]] | | | connection node that runs FAITH-daemon (usually a router) v | - ========+======== IPv4/v6 network in your site + ========+======== IPv4/v6 network in your site | (123.0.0.0/8) IPv4 web server |