[linux-help] Re: One-way-telnet

[Bruce Bales <bbales@xxxxxxxxxxx>]

Jeff Vian wrote:

> 1.  Unless you have a telnet server running on the windows box you can't
> telnet to it.

I'll try to find out later how to start a telnet server on the windows box.

> 2.  On the RH box check hosts.allow (as was said), and check that telnet is
> enabled. Look in /etc/inetd.conf

I corrected hosts.allow - no help.
The client has no /etc/inetd.conf.  Can I just copy the file from the gateway
machine?

> Also try telneting from the RH box to itself. That will let you know if the
> RH box is setup to accept telnet.

The gateway machine can telnet itself.  The client says, "unable to connect:
connection refused."

> 3.  However, I suspect routing is the problem.
> I do not see a default route on what you sent.
> Actually I see two gateways listed. ( the lines with UG in the FLAGS
> column ), and these point to BOTH NICs.
> You should have one gateway listed as default, and the cable connection is
> correctly trying to assign a default route on eth0.

Apparently "netstat -r" and "route -e" provide the same thing.  I got my route
table with "route -en"  If I use "route -e" the 0.0.0.0 is replaced by
"default."  Names replace the decimal dotted IP numbers.  (Using -en gives an
instantaneous reply; using -e delays printing the last line about 30 or more
seconds.)

The additional gateway listed in the route table comes from netconf.  In my
fumbling around with netconf, I added a "gateway to additional networks," and
now I can't get rid of it.  Netconf has an add button, but no delete.  The route
table appears to be in /proc/net/route.  Normal editing doesn't seem to work in
/proc, so I have no idea how to delete the second gateway entry.

> The lines in /etc/sysconfig/network file for the default gateway on eth1 is
> likely the problem.

I commented out the GATEWAY lines.  No effect.

> Thanks very much,

bruce

>
>
> All my internal PCs have the internal address of my Linux gateway as their
> default gateway (192.168.2.10).  The gateway PC gets its default route from
> the DSL connection via DHCP.
>
> My network and ifcfg files follow, along with my routing table
> I do not have either GATEWAYDEV or GATEWAY in the network file.  These are
> automatically assigned by the DSL connection.
>
> Note:   my eth1 is connected to the DSL modem and eth0 is my internal
> network.
>
> ------network ------
> NETWORKING=yes
> HOSTNAME=my.host.name
> DOMAINNAME=my.domain
>
> ------ifcfg-eth0------
> DEVICE=eth0
> IPADDR=192.168.2.10
> NETMASK=255.255.255.0
> NETWORK=192.168.2.0
> BROADCAST=192.168.2.255
> ONBOOT=yes
>
> ------ifcfg-eth1------
> DEVICE=eth1
> BOOTPROTO=dhcp
> ONBOOT=yes
>
> -----result of    netstat -r    --------
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> my.host.name *               255.255.255.255 UH        0 0          0 eth0
> 192.168.2.0     *               255.255.255.0   U         0 0          0
> eth0
> 216.63.200.0    *               255.255.252.0   U         0 0          0
> eth1
> 127.0.0.0       *               255.0.0.0       U         0 0          0 lo
> default         adsl-216-63-203 0.0.0.0         UG        0 0          0
> eth1
>
> ----- Original Message -----
> From: Steven Saner <ssaner@xxxxxxxxxxxxxxx>
> To: <linux-help@xxxxxxxxx>
> Sent: Saturday, January 06, 2001 11:21 PM
> Subject: [linux-help] Re: One-way-telnet
>
> >
> > TCP wrappers perhaps? Look in /etc/hosts.allow
> >
> >
> > On Sat, Jan 06, 2001 at 11:21:33PM -0600, Bruce Bales wrote:
> > >
> > > I have a Linux (RH6) gateway with cable internet on eth0.  eth1 hooks to
> a hub
> > > and a network of a windows 98 box and another RH6 box.  I can ping both
> ways
> > > gateway to the windows box and both ways gateway to Linux2 box.  I can
> telnet
> > > from either box on the network to the gateway.   When I try to telnet
> from the
> > > gateway to either of the others, I get " trying 192.168.0.2" (or
> 192.168.0.3)
> > > then "connection refused."
> > >
> > > ipchains is "ACCEPT", "ACCEPT", "ACCEPT".
> > >
> > > /etc/sysconfig/network,  ifconfig, and the routing table from the
> gateway box
> > > are below.  Why can I telnet only one way?
> > >
> > > bruce
> > >
> > > /sysconfig/network:
> > > NETWORKING=yes
> > > HOSTNAME=sam
> > > NISDOMAIN="mynet.com"
> > > GATEWAY='sam 192.168.0.1'
> > > GATEWAYDEV=eth1
> > > FORWARD_IPV4=no
> > >
> > > Kernel IP routing table
> > > Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> > > 192.168.0.1     0.0.0.0         255.255.255.255 UH       0 0          0
> eth1
> > > 192.168.0.0     192.168.0.1  255.255.255.0    UG       0 0          0
> eth1
> > > 192.168.0.0     0.0.0.0         255.255.255.0     U          0 0
> 0 eth1
> > >
> > > 65.27.96.0       0.0.0.0         255.255.248.0     U          0 0
> 0
> > > eth0
> > > 127.0.0.0         0.0.0.0         255.0.0.0             U          0 0
> > > 0 lo
> > > 0.0.0.0             65.27.96.1    0.0.0.0                UG        0 0
> > > 0 eth0
> > >
> > > ifconfig:
> > > eth0      Link encap:Ethernet  HWaddr 00:A0:CC:5C:AB:35
> > > inet addr:65.27.101.55  Bcast:255.255.255.255  Mask:255.255.248.0
> > > UP BROADCAST RUNNING  MTU:1500  Metric:1
> > > RX packets:2575 errors:0 dropped:0 overruns:0 frame:0
> > > TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
> > > collisions:0 txqueuelen:100
> > > Interrupt:11 Base address:0xfc00
> > >
> > > eth1      Link encap:Ethernet  HWaddr 00:00:E8:3E:F7:C8
> > > inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
> > > UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> > > RX packets:2152 errors:0 dropped:0 overruns:0 frame:0
> > > TX packets:150 errors:0 dropped:0 overruns:0 carrier:0
> > > collisions:0 txqueuelen:100
> > > Interrupt:3 Base address:0x300
> > >
> > > lo        Link encap:Local Loopback
> > > inet addr:127.0.0.1  Mask:255.0.0.0
> > > UP LOOPBACK RUNNING  MTU:3924  Metric:1
> > > RX packets:148 errors:0 dropped:0 overruns:0 frame:0
> > > TX packets:148 errors:0 dropped:0 overruns:0 carrier:0
> > > collisions:0 txqueuelen:0
> > >
> > >
> > >
> > >
> > >
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> >
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>
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