Date: Wed, 20 Feb 2013 15:18:47 +0100 From: Fleuriot Damien <ml@my.gd> To: mexas@bristol.ac.uk Cc: feenberg@nber.org, freebsd-questions@freebsd.org Subject: Re: cannot ssh into a box with DHCP assigned IP address Message-ID: <685C610D-D19A-46FE-851F-3A00EACF3AE3@my.gd> In-Reply-To: <201302201355.r1KDt8Lt063091@mech-cluster241.men.bris.ac.uk> References: <201302201355.r1KDt8Lt063091@mech-cluster241.men.bris.ac.uk>
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On Feb 20, 2013, at 2:55 PM, Anton Shterenlikht <mexas@bristol.ac.uk> wrote: > From feenberg@nber.org Wed Feb 20 13:39:28 2013 > > > From: Fleuriot Damien <ml@my.gd> > > To: mexas@bristol.ac.uk > > Subject: Re: cannot ssh into a box with DHCP assigned IP address > > Date: Wed, 20 Feb 2013 10:31:22 +0100 > > Cc: freebsd-questions@freebsd.org > > > > On Feb 20, 2013, at 10:28 AM, Anton Shterenlikht <mexas@bristol.ac.uk> wrote: > > > > > I have a laptop with FreeBSD -current, > > > with ip address assigned via DHCP. > > > The laptop has neither a static ip address, > > > nor a domain. > > > > > > I can ping the laptop fine, but cannot > > > ssh into it. The sshd is running, /etc/ssh/ssd_config > > > seems fine, /etc/hosts.allow is fine. > > > However, /etc/hosts is just the default: > > While on the problem machine, can you ssh to localhost? ssh to the IP > address? > > yes to both > > I would suspect the problem is in /etc/hosts.allow > or /etc/hosts.deny, > > The first non-comment line in /etc/hosts.allow is > ALL : ALL : allow > > and I don't have /etc/hosts.deny: > > root@zzz:~ # ls /etc/hosts* > /etc/hosts /etc/hosts.equiv > /etc/hosts.allow /etc/hosts.lpd > root@zzz:~ # > > or perhaps the subnet mask is incorrect. > > Well.. what should it be? > I have on the problem box (ssh server): > > wlan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1 > 500 > ether 00:21:5c:50:68:c3 > inet 172.21.220.12 netmask 0xfffffc00 broadcast 255.255.255.255 > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > media: IEEE 802.11 Wireless Ethernet OFDM/54Mbps mode 11g > status: associated > ssid eduroam channel 1 (2412 MHz 11g) bssid 00:3a:98:62:cd:a0 > country US authmode WPA2/802.11i privacy ON deftxkey UNDEF > AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 14 bmiss 10 scanvalid 450 > bgscan bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 5 > protmode CTS wme roaming MANUAL > > I'm trying to ssh from 137.222.187.241. > > I wonder, perhaps it somehow built into the > Eduroam wireless, provided by the University, > that the devices connected to it cannot be > accessible. They can only initiate outgoing > connections, but all incoming connections are > somehow blocked? Given that the majority of > the devices will be unsecured MS boxes, maybe > the university thought that this is wise idea > for safety. Perhaps I can investigate this > with my IT guys. > > Or I might be talking complete nonsense here, not my area at all. > > Thanks > > Anton > Any luck with Daniel's suggestion to try it directly on the problematic host ? ssh 127.0.0.1 ssh localhost ssh 172.21.220.12
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