James Trickle uP<p>I have been having Secure Shell hangs when sending/receiving bulk data (large packets) between my workstation and a WAN server. I think I've discovered bad behavior somewhere in the WAN.</p><p>I figured it out by pinging the remote host using different sized packets with the Do Not Fragment bit set. Above a certain size, one is supposed to go from receiving ping responses to getting back ICMP error packets indicating the packet was too large and that fragmentation is needed, along with the MTU size to use. This called Path MTU Discovery.</p><p>Instead of that I get three behaviors: ping response for small packets, silence for midsized packets (bad!), and error response for too-large packets.</p><p>This is really bad news, and it seems TCP just stops working if it can't get those too-large packets through.</p><p>Anyway, the WAN provider apparently autonomously rebooted their equipment, and the problem is now gone, but it has been dogging me intermittently the last several months. It's a real pain when ssh craps out when cat'ing a long file or git fetch sessions hang.</p><p>I now have the start of a tool that I can use to monitor that bad behavior is happening, though.</p><p><a href="https://hachyderm.io/tags/networking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>networking</span></a> <a href="https://hachyderm.io/tags/IP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>IP</span></a> <a href="https://hachyderm.io/tags/Internet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Internet</span></a> <a href="https://hachyderm.io/tags/MTU" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MTU</span></a> <a href="https://hachyderm.io/tags/whine" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>whine</span></a> <a href="https://hachyderm.io/tags/software" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>software</span></a> <a href="https://hachyderm.io/tags/WAN" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>WAN</span></a> <a href="https://hachyderm.io/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <a href="https://hachyderm.io/tags/ICMP" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ICMP</span></a> <a href="https://hachyderm.io/tags/routing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>routing</span></a></p>
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#secureshell
1 post · 1 participant · 0 posts today
OSTechNix<p>How Tmux Saved My Work When SSH Kept Dropping and Why You Should Use Tmux for Unstable SSH Connections in Linux <a href="https://floss.social/tags/tmux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>tmux</span></a> <a href="https://floss.social/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ssh</span></a> <a href="https://floss.social/tags/secureshell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>secureshell</span></a> <a href="https://floss.social/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linux</span></a> <a href="https://floss.social/tags/tmuxtips" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>tmuxtips</span></a> <a href="https://floss.social/tags/linuxadministration" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linuxadministration</span></a> <br><a href="https://ostechnix.com/use-tmux-unstable-ssh/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/use-tmux-unstabl</span><span class="invisible">e-ssh/</span></a></p>
Raven<p>OpenSSH 10.0 released with hybrid post-quantum algorithm mlkem768x25519-sha256 as default key agreement, new cipher preference list, new options, bug fixes</p><p><a href="https://www.openssh.com/releasenotes.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">openssh.com/releasenotes.html</span><span class="invisible"></span></a></p><p><a href="https://mastodon.bsd.cafe/tags/openssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openssh</span></a> <a href="https://mastodon.bsd.cafe/tags/openbsd" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openbsd</span></a> <a href="https://mastodon.bsd.cafe/tags/infosec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>infosec</span></a> <a href="https://mastodon.bsd.cafe/tags/secureshell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>secureshell</span></a> <a href="https://mastodon.bsd.cafe/tags/postquantumcryptography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>postquantumcryptography</span></a></p>
OSTechNix<p>Pico.sh: The SSH-Powered Services Every Developer Should Try <a href="https://floss.social/tags/Pico" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Pico</span></a> <a href="https://floss.social/tags/SSH" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SSH</span></a> <a href="https://floss.social/tags/Developer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Developer</span></a> <a href="https://floss.social/tags/Webservice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Webservice</span></a> <a href="https://floss.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linux</span></a> <a href="https://floss.social/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <br><a href="https://ostechnix.com/pico-sh-ssh-powered-developer-services/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/pico-sh-ssh-powe</span><span class="invisible">red-developer-services/</span></a></p>
OSTechNix<p>A Complete Guide to Install, Enable, and Secure SSH on Fedora Linux 42 <a href="https://floss.social/tags/SSH" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SSH</span></a> <a href="https://floss.social/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <a href="https://floss.social/tags/Fedora" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Fedora</span></a> <a href="https://floss.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linux</span></a> <a href="https://floss.social/tags/Security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Security</span></a> <a href="https://floss.social/tags/Linuxhowto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxhowto</span></a> <a href="https://floss.social/tags/Linuxadmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxadmin</span></a> <br><a href="https://ostechnix.com/set-up-configure-ssh-fedora/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/set-up-configure</span><span class="invisible">-ssh-fedora/</span></a></p>
OSTechNix<p>Critical OpenSSH Vulnerability Patched: Here's What You Need to Know <a href="https://floss.social/tags/openssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openssh</span></a> <a href="https://floss.social/tags/regreSSHion" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>regreSSHion</span></a> <a href="https://floss.social/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ssh</span></a> <a href="https://floss.social/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <a href="https://floss.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linux</span></a> <a href="https://floss.social/tags/openssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openssh</span></a> <a href="https://floss.social/tags/security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>security</span></a> <br><a href="https://ostechnix.com/regresshion-cve-2024-6387-bug-is-patched-in-openssh-9-8/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/regresshion-cve-</span><span class="invisible">2024-6387-bug-is-patched-in-openssh-9-8/</span></a></p>
IT News<p>SSH backdoor has infected 400,000 Linux servers over 15 years and keeps on spreading - Enlarge (credit: BeeBright / Getty Images / iStockphoto) </p><p>Infra... - <a href="https://arstechnica.com/?p=2024591" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arstechnica.com/?p=2024591</span><span class="invisible"></span></a> <a href="https://schleuss.online/tags/uncategorized" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>uncategorized</span></a> <a href="https://schleuss.online/tags/secureshell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>secureshell</span></a> <a href="https://schleuss.online/tags/security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>security</span></a> <a href="https://schleuss.online/tags/openssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openssh</span></a> <a href="https://schleuss.online/tags/biz" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biz</span></a> <a href="https://schleuss.online/tags/ebury" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ebury</span></a> <a href="https://schleuss.online/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linux</span></a> <a href="https://schleuss.online/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ssh</span></a></p>
OSTechNix<p>How To Install openSSH on NixOS <a href="https://floss.social/tags/nixos" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nixos</span></a> <a href="https://floss.social/tags/openssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>openssh</span></a> <a href="https://floss.social/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ssh</span></a> <a href="https://floss.social/tags/secureshell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>secureshell</span></a> <a href="https://floss.social/tags/security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>security</span></a> <a href="https://floss.social/tags/linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linux</span></a> <a href="https://floss.social/tags/linuxadmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linuxadmin</span></a> <a href="https://floss.social/tags/linuxhowto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>linuxhowto</span></a> <br><a href="https://ostechnix.com/install-openssh-nixos/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/install-openssh-</span><span class="invisible">nixos/</span></a></p>
OSTechNix<p>How to Manage Multiple SSH Connections in Linux Efficiently (Step-by-Step Guide) <a href="https://floss.social/tags/ssh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ssh</span></a> <a href="https://floss.social/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <a href="https://floss.social/tags/Linuxsecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxsecurity</span></a> <a href="https://floss.social/tags/Linuxadmin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxadmin</span></a> <a href="https://floss.social/tags/Linuxhowto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxhowto</span></a> <a href="https://floss.social/tags/Security" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Security</span></a> <a href="https://floss.social/tags/COmmandline" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>COmmandline</span></a> <br><a href="https://ostechnix.com/manage-multiple-ssh-connections-in-linux/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/manage-multiple-</span><span class="invisible">ssh-connections-in-linux/</span></a></p>
Scripter :verified_flashing:<p>Terrapin: Bochumer Forscher beweisen, dass SSH nicht mehr sicher ist<br><a href="https://m.winfuture.de/news/140297" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">m.winfuture.de/news/140297</span><span class="invisible"></span></a> <a href="https://social.tchncs.de/tags/SecureShell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SecureShell</span></a> <a href="https://social.tchncs.de/tags/SSH" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SSH</span></a></p>
OSTechNix<p>How To Configure SSH Key-based Authentication In Linux <a href="https://floss.social/tags/SSH" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SSH</span></a> <a href="https://floss.social/tags/Secureshell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Secureshell</span></a> <a href="https://floss.social/tags/Keybasedauthentication" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Keybasedauthentication</span></a> <a href="https://floss.social/tags/Linuxsecurity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxsecurity</span></a> <a href="https://floss.social/tags/Linuxadministration" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxadministration</span></a> <a href="https://floss.social/tags/Linuxhowto" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linuxhowto</span></a> <a href="https://floss.social/tags/Linux" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Linux</span></a> <br><a href="https://ostechnix.com/configure-ssh-key-based-authentication-linux/" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://</span><span class="ellipsis">ostechnix.com/configure-ssh-ke</span><span class="invisible">y-based-authentication-linux/</span></a></p>
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