I can't login to Drupal as my session cookie was deleted?
Pound passes along the client IP appropriately, but it needs to be forcibly set for non-https (http) requests to Varnish.

if (req.http.X-Forwarded-Proto !~ "https") {
  remove req.http.X-Forwarded-For;
  set req.http.X-Forwarded-For = client.ip;
}