Tweak ssh settings for flakey networks / hosts

hosts/dionach.nix

@@ -125,7 +125,7 @@
     texlive.combined.scheme-full
     tmate                         # Instant Terminal Sharing
     tpm-tools
-    tor-browser-bundle-bin
+    #tor-browser-bundle-bin
     tree                          # Command to produce a depth indented directory listing
     udevil
     unrar
@@ -200,6 +200,14 @@
     opengl.enable = true;
   };
 
+  # The below pair are set to overcome flakey connections / busy servers that
+  # fail to respond to ssh keep alive requests, sometimes triggering:
+  # client_loop: send disconnect: Broken pipe
+  programs.ssh.extraConfig = ''
+    ServerAliveInterval 20
+    TCPKeepAlive no
+  '';
+
   # This value determines the NixOS release with which your system is to be
   # compatible, in order to avoid breaking some software such as database
   # servers. You should change this only after NixOS release notes say you