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If you use the tproxy method with a large subnet (such as 0/0), then (1) you may not receive UDP packets that sshuttle/tproxy can handle and (2) you are unable to connect to your machine using an IP that your computer recognizes as its own. To resolve those issues, any traffic to an IP that the host knows is local, does not go through the sshuttle chains.
40 lines
1.6 KiB
ReStructuredText
40 lines
1.6 KiB
ReStructuredText
TPROXY
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======
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TPROXY is the only method that has full support of IPv6 and UDP.
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There are some things you need to consider for TPROXY to work:
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- The following commands need to be run first as root. This only needs to be
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done once after booting up::
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ip route add local default dev lo table 100
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ip rule add fwmark {TMARK} lookup 100
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ip -6 route add local default dev lo table 100
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ip -6 rule add fwmark {TMARK} lookup 100
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where {TMARK} is the identifier mark passed with -t or --tmark flag (default value is 1).
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- The ``--auto-nets`` feature does not detect IPv6 routes automatically. Add IPv6
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routes manually. e.g. by adding ``'::/0'`` to the end of the command line.
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- The client needs to be run as root. e.g.::
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sudo SSH_AUTH_SOCK="$SSH_AUTH_SOCK" $HOME/tree/sshuttle.tproxy/sshuttle --method=tproxy ...
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- You may need to exclude the IP address of the server you are connecting to.
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Otherwise sshuttle may attempt to intercept the ssh packets, which will not
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work. Use the ``--exclude`` parameter for this.
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- You need the ``--method=tproxy`` parameter, as above.
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- The routes for the outgoing packets must already exist. For example, if your
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connection does not have IPv6 support, no IPv6 routes will exist, IPv6
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packets will not be generated and sshuttle cannot intercept them::
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telnet -6 www.google.com 80
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Trying 2404:6800:4001:805::1010...
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telnet: Unable to connect to remote host: Network is unreachable
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Add some dummy routes to external interfaces. Make sure they get removed
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however after sshuttle exits.
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