Douglas Adams and Deep Thought was wrong, 42 is not the answer #490
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I actually hate this hack, and have considered removing it, but not quite game enough... Thanks for the patch. |
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Thanks a lot, @brianmay 👍 |
skuhl
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Jul 12, 2021
Previously, it was possible to run sshuttle locally without using ssh and connecting to a remote server. In this configuration, traffic was redirected to the sshuttle server running on the localhost. However, the firewall needed to distinguish between traffic leaving the sshuttle server and traffic that originated from the machine that still needed to be routed through the sshuttle server. The TTL of the packets leaving the sshuttle server were manipulated to indicate to the firewall what should happen. The TTL was adjusted for all packets leaving the sshuttle server (even if it wasn't necessary because the server and client were running on different machines). Changing the TTL caused trouble and some machines, and the --ttl option was added as a workaround to change how the TTL was set for traffic leaving sshuttle. All of this added complexity to the code for a feature (running the server on localhost) that is likely only used for testing and rarely used by others. This commit updates the associated documentation, but doesn't fully fix the ipfw method since I am unable to test that. This change will also make sshuttle fail to work if -r is used to specify a localhost. Pull request sshuttle#610 partially addresses that issue. For example, see: sshuttle#240, sshuttle#490, sshuttle#660, sshuttle#606.
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It might come as a surprise but some cross-region connections between AWS us-east-1 and AWS us-west-2 are currently routing through more than 42 hops. I might be wrong but if we can set the IP4 TTL to any non-default number 63 might be a better choice to get us close to the Linux default of 64?