Date: Wed, 20 Feb 2013 09:45:52 GMT From: Anton Shterenlikht <mexas@bristol.ac.uk> To: mexas@bristol.ac.uk, ml@my.gd Cc: freebsd-questions@freebsd.org Subject: Re: cannot ssh into a box with DHCP assigned IP address Message-ID: <201302200945.r1K9jpq7029535@mech-cluster241.men.bris.ac.uk> In-Reply-To: <96231D6F-D725-46F8-A9EC-23DBD7FC523E@my.gd>
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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:
>
> #
> ::1 localhost localhost.my.domain
> 127.0.0.1 localhost localhost.my.domain
> #
>
> Is it the lack of a domain that prevents
> me from getting ssh access?
> I try to ssh with just a dynamic ip address,
> for which ping seems to work fine.
> Or is the problem somewhere else?
>
> I'm not even sure I'm asking the right
> questions.
>
> Thanks
>
> Anton
First, check what ports SSH listens on:
sockstat | grep ssh
root@zzz:~ # sockstat | grep ssh
mexas ssh 16193 3 tcp4 172.21.220.12:20541 137.222.187.241:22
root sshd 1091 3 tcp6 *:22 *:*
root sshd 1091 4 tcp4 *:22 *:*
root@zzz:~ #
I also see:
/var/log/auth.log:Feb 18 11:54:25 zzz sshd[1091]: Server listening on :: port 22
.
/var/log/auth.log:Feb 18 11:54:25 zzz sshd[1091]: Server listening on 0.0.0.0 po
rt 22.
Is 0.0.0.0 expected?
Anything else I should check in the logs?
Then, assuming SSH indeed listens on *:22 ,
check if you have a firewall running that
could be preventing packets from reaching your box.
I don't think so.
There's nothing in the kernel config
By the way, do you get a login prompt at all,
over SSH, or just a plain timeout or connection reset ?
Just a timeout:
root@zzz:~ # ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
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
root@zzz:~ #
TZAV> ping 172.21.220.12
PING 172.21.220.12 (172.21.220.12): 56 data bytes
64 bytes from 172.21.220.12: icmp_seq=0 ttl=60 time=2.056 ms
64 bytes from 172.21.220.12: icmp_seq=1 ttl=60 time=1.766 ms
^C
TZAV> ssh 172.21.220.12
ssh: connect to host 172.21.220.12 port 22: Operation timed out
TZAV>
Thanks
Anton
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