host github.com
github.com has address 140.82.121.3
github.com mail is handled by 5 alt2.aspmx.l.google.com.
github.com mail is handled by 1 aspmx.l.google.com.
github.com mail is handled by 10 alt3.aspmx.l.google.com.
github.com mail is handled by 10 alt4.aspmx.l.google.com.
github.com mail is handled by 5 alt1.aspmx.l.google.com.
So when you try to install llnode, it fails
fatal: unable to access 'https://github.com/llvm-mirror/lldb.git/': Couldn't connect to server
child_process.js:656
throw err;
^
Error: Command failed: git clone --depth 1 --branch release_60 https://github.com/llvm-mirror/lldb.git /node_modules/llnode/lldb-6.0
github.com has no ipv6 address
So when you try to install llnode, it fails
https://github.com/nodejs/llnode/blob/4b868f707670ecc50cbb43459130640a02707815/scripts/lldb.js#L48
Is there any way not to use github.com while installing?