cannot ssh into a box with DHCP assigned IP address
mexas at bristol.ac.uk
Wed Feb 20 14:42:44 UTC 2013
From ml at my.gd Wed Feb 20 14:39:34 2013
On Feb 20, 2013, at 2:55 PM, Anton Shterenlikht <mexas at bristol.ac.uk> wrote:
> From feenberg at nber.org Wed Feb 20 13:39:28 2013
> > From: Fleuriot Damien <ml at my.gd>
> > To: mexas at 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 at freebsd.org
> > On Feb 20, 2013, at 10:28 AM, Anton Shterenlikht <mexas at 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
> 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 at zzz:~ # ls /etc/hosts*
> /etc/hosts /etc/hosts.equiv
> /etc/hosts.allow /etc/hosts.lpd
> root at 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
> 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 188.8.131.52.
> 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.
Any luck with Daniel's suggestion to try it directly on the problematic host ?
yes to all (I replied already above).
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