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Bug#807081: openssh-server: Does not set TCP_NODELAY on X11 forward

Package: openssh-server
Version: 1:6.7p1-5
Severity: normal

Seems to me that sshd should, but does not, set TCP_NODELAY on the port
used for X11 forwarding. I am not sure about other forwarded ports;
sshd seems to set TCP_NODELAY and also IPTOS_LOWDELAY on the "command"
connection only.

Quoting from
   - TCP_NODELAY set on X11 and TCP forwarding endpoints

Is this a bug that could be fixed?

Thanks, Paul

Paul Szabo   psz@maths.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

-- System Information:
Debian Release: 8.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (x86_64)

Kernel: Linux 3.16.7-ckt11-pk07.14-amd64 (SMP w/8 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages openssh-server depends on:
ii  adduser                3.113+nmu3
ii  debconf [debconf-2.0]  1.5.56
ii  dpkg                   1.17.26
ii  init-system-helpers    1.22
ii  libc6                  2.19-18+deb8u1
ii  libcomerr2             1.42.12-1.1
ii  libgssapi-krb5-2       1.12.1+dfsg-19+deb8u1
ii  libkrb5-3              1.12.1+dfsg-19+deb8u1
ii  libpam-modules         1.1.8-3.1
ii  libpam-runtime         1.1.8-3.1
ii  libpam0g               1.1.8-3.1
ii  libselinux1            2.3-2
ii  libssl1.0.0            1.0.1k-3+deb8u1
ii  libwrap0               7.6.q-25
ii  lsb-base               4.1+Debian13+nmu1
ii  openssh-client         1:6.7p1-5
ii  openssh-sftp-server    1:6.7p1-5
ii  procps                 2:3.3.9-9
ii  zlib1g                 1:1.2.8.dfsg-2+b1

Versions of packages openssh-server recommends:
ii  ncurses-term  5.9+20140913-1
ii  xauth         1:1.0.9-1

Versions of packages openssh-server suggests:
pn  molly-guard   <none>
pn  monkeysphere  <none>
pn  rssh          <none>
pn  ssh-askpass   <none>
pn  ufw           <none>

-- debconf information excluded

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