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fuss:openssh [2019/05/03 09:08] – [Restrict Users to SFTP only Instead of SSH] office | fuss:openssh [2025/02/16 15:33] (current) – external edit 127.0.0.1 | ||
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- | ====== Remove Duplicate Keys ====== | ||
- | |||
- | Sometimes when '' | ||
- | |||
- | < | ||
- | Warning: the ECDSA host key for ' | ||
- | Offending key for IP in / | ||
- | Matching host key in / | ||
- | Are you sure you want to continue connecting (yes/no)? | ||
- | |||
- | </ | ||
- | |||
- | The offending key can be removed easily using '' | ||
- | <code bash> | ||
- | sed -i 30d / | ||
- | </ | ||
- | |||
- | which deletes line '' | ||
====== Generate Public Key ====== | ====== Generate Public Key ====== | ||
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</ | </ | ||
+ | ====== Fixing Various Network Issues ====== | ||
+ | Any of the following symptoms are to be detected? | ||
+ | * SSH connections drop, | ||
+ | * issuing commands with large output over SSH makes the SSH session hang | ||
+ | |||
+ | They may all boil down to a non-uniform MTU setting across the network. This problem typically shows up with IoT devices (including the Raspberry Pi) that have a trimmed down networking stack (either wireless or low end network devices) that do not allow setting the MTU past '' | ||
+ | |||
+ | In case changing the MTU for the entire network is undesirable, | ||
+ | < | ||
+ | net.ipv4.ip_no_pmtu_disc = 1 | ||
+ | net.ipv4.tcp_mtu_probing = 2 | ||
+ | </ | ||
+ | |||
+ | are set with '' | ||
+ | |||
+ | ====== Remove Host and Key from SSH (known_hosts) ====== | ||
+ | |||
+ | {{fuss: | ||
+ | |||
+ | Or better yet: | ||
+ | <code bash> | ||
+ | sed '/ | ||
+ | </ | ||
+ | where: | ||
+ | * '' | ||
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