[Bug 816313] [NEW] "ssh -b x.x.x.x" or "ssh -o BindAddress=x.x.x.x" does not work.

[m.bosner]

Public bug reported:

I got a machine which has eight public ip addresses bound to eth0,
eth0:0, eth0:1, eth0:2 etc.

If i try to bind an address using -b for outgoing connections it just
fails to do so but creates the connection without any warning or
message:

ssh -v -o UsePrivilegedPort=no -o BindAddress=x.x.x.131 other-host.com
or
ssh -v -b x.x.x.131 other-host.com

OpenSSH_5.8p1 Debian-1ubuntu3, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /root/.ssh/config
debug1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to other-host.com [x.x.x.x] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-4ubuntu5
debug1: match: OpenSSH_5.5p1 Debian-4ubuntu5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-1ubuntu3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA a8:4b:a6:8f:0e:56:96:cb:df:15:31:84:de:30:5e:fe
debug1: Host 'other-host.com' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:20
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: mbosner at S510-X-CBCEG
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Next authentication method: password
root at other-host.com's password: 
debug1: Authentication succeeded (password).
Authenticated to other-host.com ([x.x.x.x]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions at openssh.com
debug1: Entering interactive session.
debug1: Requesting authentication agent forwarding.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
Linux gatekeeper 2.6.35-30-generic #54-Ubuntu SMP Tue Jun 7 18:41:54 UTC 2011 x86_64 GNU/Linux
Ubuntu 10.10

Welcome to Ubuntu!
 * Documentation:  https://help.ubuntu.com/
New release 'natty' available.
Run 'do-release-upgrade' to upgrade to it.

You have new mail.
Last login: Tue Jul 26 10:58:03 2011 from x.x.x.130     <- IMPORTANT!

netstat -at | grep EST
tcp        0      0 x.x.x.x:ssh      x.x.x.130:46113    ESTABLISHED  <-

The outgoing address is x.x.x.130 instead of x.x.x.131

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: address bind ssh

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https://bugs.launchpad.net/bugs/816313

Title:
  "ssh -b x.x.x.x" or "ssh -o BindAddress=x.x.x.x" does not work.

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