mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-16 12:53:17 +00:00
#75, update docs
This commit is contained in:
Erik Ekman
parent
a02f7d776f
commit
3703485c9c
32
README
32
README
|
|
@ -70,14 +70,8 @@ add a route to the nameserver you use with the default gateway as gateway. Then
|
|||
replace the default gateway with the servers IP address within the DNS tunnel,
|
||||
and configure the server to do NAT.
|
||||
|
||||
MTU issues:
|
||||
These issues should be solved now, with automatic fragmentation of downstream
|
||||
packets. There should be no need to set the MTU explicitly on the server.
|
||||
|
||||
If you have problems, try inspecting the traffic with network monitoring tools
|
||||
and make sure that the relaying DNS server has not cached the response. A
|
||||
cached error message could mean that you started the client before the server.
|
||||
The -D option on the server can also show received and sent queries.
|
||||
The DNS-response fragment size is normally autoprobed to get maximum bandwidth.
|
||||
To force a specific value (and speed things up), use the -m option.
|
||||
|
||||
The iodined server replies to NS requests sent for subdomains of the tunnel
|
||||
domain. If your domain is tunnel.com, send a NS request for foo.tunnel.com
|
||||
|
|
@ -90,6 +84,21 @@ and one query can be max 256 chars. Each domain name part can be max 63 chars.
|
|||
So your domain name and subdomain should be as short as possible to allow
|
||||
maximum upstream throughput.
|
||||
|
||||
The default is to use DNS NULL-type queries, as this provides the largest
|
||||
downstream bandwidth. If your DNS server blocks NULL requests, try TXT or
|
||||
CNAME queries via the -T option. Also supported are A (returning CNAME) and
|
||||
MX requests, but these may/will cause additional lookups by "smart" caching
|
||||
nameservers to get an actual IP address, which may either slow down or fail
|
||||
completely. DNS responses for non-NULL are Base32 encoded by default, which
|
||||
should always work. For more bandwidth, try Base64 or Raw (TXT only) via the
|
||||
-O option. If Base64/Raw doesn't work, you'll see many failures in the
|
||||
fragment size autoprobe.
|
||||
|
||||
If you have problems, try inspecting the traffic with network monitoring tools
|
||||
and make sure that the relaying DNS server has not cached the response. A
|
||||
cached error message could mean that you started the client before the server.
|
||||
The -D (and -DD) option on the server can also show received and sent queries.
|
||||
|
||||
|
||||
TIPS & TRICKS:
|
||||
|
||||
|
|
@ -99,6 +108,13 @@ use for instance iptables (on Linux) to forward the traffic:
|
|||
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 53 -j DNAT --to :5353
|
||||
(Sent in by Tom Schouten)
|
||||
|
||||
Iodined will reject data from clients that have not been active (data/pings)
|
||||
for more than 60 seconds. In case of a long network outage or similar, just
|
||||
stop iodine and restart (re-login), possibly multiple times until you get
|
||||
your old IP address back. Once that's done, just wait a while, and you'll
|
||||
eventually see the tunneled TCP traffic continue to flow from where it left
|
||||
off before the outage.
|
||||
|
||||
|
||||
PORTABILITY:
|
||||
|
||||
|
|
|
|||
93
man/iodine.8
93
man/iodine.8
|
|
@ -1,5 +1,5 @@
|
|||
.\" groff -man -Tascii iodine.8
|
||||
.TH IODINE 8 "JUL 2008" "User Manuals"
|
||||
.TH IODINE 8 "SEP 2009" "User Manuals"
|
||||
.SH NAME
|
||||
iodine, iodined \- tunnel IPv4 over DNS
|
||||
.SH SYNOPSIS
|
||||
|
|
@ -23,6 +23,10 @@ iodine, iodined \- tunnel IPv4 over DNS
|
|||
.I context
|
||||
.B ] [-F
|
||||
.I pidfile
|
||||
.B ] [-T
|
||||
.I dnstype
|
||||
.B ] [-O
|
||||
.I downenc
|
||||
.B ]
|
||||
.B [
|
||||
.I nameserver
|
||||
|
|
@ -46,7 +50,7 @@ iodine, iodined \- tunnel IPv4 over DNS
|
|||
.B ] [-p
|
||||
.I port
|
||||
.B ] [-n
|
||||
.I external ip
|
||||
.I external_ip
|
||||
.B ] [-b
|
||||
.I dnsport
|
||||
.B ] [-P
|
||||
|
|
@ -111,40 +115,78 @@ of the iodined host and test if it is reachable directly. If it is, traffic
|
|||
will be sent to the server instead of the DNS relay.
|
||||
.TP
|
||||
.B -m fragsize
|
||||
Maximum downstream fragsize. Not setting this will cause the client to probe
|
||||
the maximum accepted downstream packet size.
|
||||
Force maximum downstream fragment size. Not setting this will cause the
|
||||
client to automatically probe the maximum accepted downstream fragment size.
|
||||
.TP
|
||||
.B -T dnstype
|
||||
DNS request type.
|
||||
.I NULL
|
||||
is default. If this doesn't work, try
|
||||
.I TXT
|
||||
(some less bandwidth) or
|
||||
.I CNAME
|
||||
(much less bandwidth). Also supported are
|
||||
.I A
|
||||
(returning CNAME) and
|
||||
.I MX
|
||||
requests, but these may/will cause additional lookups by "smart" caching
|
||||
nameservers to get an actual IP address, which may either slow down or fail
|
||||
completely.
|
||||
.TP
|
||||
.B -O downenc
|
||||
Downstream encoding for all query type responses except NULL.
|
||||
.I Base32
|
||||
is default and should always work.
|
||||
.I Base64
|
||||
provides more bandwidth, but may not work on all nameservers.
|
||||
For TXT queries,
|
||||
.I Raw
|
||||
will provide maximum performance. This will only work if the nameserver
|
||||
path is fully 8-bit-clean for responses that are assumed to be "legible text".
|
||||
.SS Server Options:
|
||||
.TP
|
||||
.B -c
|
||||
Disable checks on client IP on all incoming requests.
|
||||
Disable checking the client IP address on all incoming requests.
|
||||
By default, requests originating from non-matching IP adresses will be
|
||||
rejected, however this will cause problems when requests are routed
|
||||
via a cluster of DNS servers.
|
||||
.TP
|
||||
.B -s
|
||||
Don't try to configure IP address or MTU. This should only be used if
|
||||
you have already configured the device that will be used.
|
||||
Don't try to configure IP address or MTU.
|
||||
This should only be used if you have already configured the device that will be
|
||||
used.
|
||||
.TP
|
||||
.B -D
|
||||
Increase debug level. Level 1 prints info about each RX/TX packet.
|
||||
Implies the
|
||||
.B -f
|
||||
option.
|
||||
.TP
|
||||
.B -m mtu
|
||||
Set 'mtu' as mtu size for the tunnel device. This will be sent to the client
|
||||
on connect, and the client will use the same mtu.
|
||||
Set 'mtu' as mtu size for the tun device.
|
||||
This will be sent to the client on login, and the client will use the same mtu
|
||||
for its tun device. Default 1200. Note that the DNS traffic will be
|
||||
automatically fragmented when needed.
|
||||
.TP
|
||||
.B -l listen_ip
|
||||
Make the server listen only on 'listen_ip' instead of on 0.0.0.0 for incoming
|
||||
connections.
|
||||
Make the server listen only on 'listen_ip' for incoming requests.
|
||||
By default, incoming requests are accepted from all interfaces.
|
||||
.TP
|
||||
.B -p port
|
||||
Make the server listen on 'port' instead of 53 for traffic.
|
||||
.B Note:
|
||||
You must make sure the dns requests are forwarded to this port yourself.
|
||||
.TP
|
||||
.B -n external ip
|
||||
.B -n external_ip
|
||||
The IP address to return in NS responses. Default is to return the address used
|
||||
as destination in the query.
|
||||
.TP
|
||||
.B -b dnsport
|
||||
If this port is specified, all incoming requests not inside the tunnel domain
|
||||
will be forwarded to this port on localhost, to be handled by a real dns.
|
||||
.B Note:
|
||||
The forwarding is not fully transparent, and not advised for use
|
||||
in production environments.
|
||||
.SS Client Arguments:
|
||||
.TP
|
||||
.B nameserver
|
||||
|
|
@ -156,7 +198,7 @@ from the
|
|||
file.
|
||||
.TP
|
||||
.B topdomain
|
||||
The dns traffic will be sent as querys of type NULL for subdomains under
|
||||
The dns traffic will be sent as queries for subdomains under
|
||||
\'topdomain'. This is normally a subdomain to a domain you own. Use a short
|
||||
domain name to get better throughput. If
|
||||
.B nameserver
|
||||
|
|
@ -165,17 +207,19 @@ must be the same on both the client and the server.
|
|||
.SS Server Arguments:
|
||||
.TP
|
||||
.B tunnel_ip[/netmask]
|
||||
This is the servers ip address on the tunnel interface. The client will be
|
||||
+This is the server's ip address on the tun interface. The client will be
|
||||
given the next ip number in the range. It is recommended to use the
|
||||
10.0.0.0 or 172.16.0.0 ranges. The default netmask is /27, can be overriden
|
||||
by specifying it here. Using a smaller network will limit the number of
|
||||
concurrent users.
|
||||
.TP
|
||||
.B topdomain
|
||||
The dns traffic will is expected to be sent as querys of type NULL for
|
||||
+The dns traffic is expected to arrive as queries for
|
||||
subdomains under 'topdomain'. This is normally a subdomain to a domain you
|
||||
own. Use a short domain name to get better throughput. This argument must be
|
||||
the same on both the client and the server.
|
||||
the same on both the client and the server. Queries for domains other
|
||||
than 'topdomain' will be forwarded when the \-b option is given, otherwise
|
||||
they will be dropped.
|
||||
.SH EXAMPLES
|
||||
.SS Quickstart:
|
||||
.TP
|
||||
|
|
@ -254,6 +298,20 @@ dig \-t NS foo123.tunnel.com
|
|||
.B MTU issues:
|
||||
These issues should be solved now, with automatic fragmentation of downstream
|
||||
packets. There should be no need to set the MTU explicitly on the server.
|
||||
.SH SECURITY
|
||||
Login is a relatively secure challenge-response MD5 hash, with the
|
||||
password never passing the wire.
|
||||
However, all other data is
|
||||
.B NOT
|
||||
encrypted in any way. The DNS traffic is also vulnerable to replay,
|
||||
injection and man-in-the-middle attacks, especially when iodined is used
|
||||
with the \-c option. Use of ssh or vpn tunneling is strongly recommended.
|
||||
On both server and client, use
|
||||
.I iptables
|
||||
,
|
||||
.I pf
|
||||
or other firewlls to block all traffic coming in from the tun interfaces,
|
||||
except to the used ssh or vpn ports.
|
||||
.SH ENVIRONMENT
|
||||
.SS IODINE_PASS
|
||||
If the environment variable
|
||||
|
|
@ -270,6 +328,9 @@ for one. The
|
|||
.B -P
|
||||
option still has preference.
|
||||
.El
|
||||
.SH SEE ALSO
|
||||
The README file in the source distribution contains some more elaborate
|
||||
information.
|
||||
.SH BUGS
|
||||
File bugs at http://dev.kryo.se/iodine/
|
||||
.SH AUTHORS
|
||||
|
|
|
|||
Loading…
Reference in a new issue