Re: iptables fubared?

[Bill Shirley <bshirley@xxxxxxxxxxxxxxxxx>]

On 10/5/2012 3:18 AM, Mark Space wrote:
> On 10/4/2012 11:27 PM, NOSpaze wrote:
> > On Thu, 2012-10-04 at 15:00 -0700, Mark Space wrote:
> > > I tried this with tcpdump running on the server.  It surprised me 
> > > when I
> > > saw tcpdump respond.  Firefox still says "cannot connect" from an
> > > external workstation, but my server is seeing something at least.
> > >
> > > I won't bore you with all of it, but here's the first bit:
> > >
> > > $ sudo  tcpdump -i eth0 -n "port 80"
> > > tcpdump: verbose output suppressed, use -v or -vv for full protocol 
> > > decode
> > > listening on eth0, link-type EN10MB (Ethernet), capture size 65535 
> > > bytes
> > > 21:54:16.482166 IP 99.92.208.198.52890 > 10.211.163.215.http: Flags 
> > > [S],
> > > seq 2014763367, win 8192, options [mss 1460,nop,wscale
> > > 2,nop,nop,sackOK], length 0
> > > 21:54:16.482251 IP 10.211.163.215.http > 99.92.208.198.52890: Flags
> > > [R.], seq 0, ack 2014763368, win 0, length 0
> > > 21:54:16.731133 IP 99.92.208.198.52891 > 10.211.163.215.http: Flags 
> > > [S],
> > > seq 1148493083, win 8192, options [mss 1460,nop,wscale
> > > 2,nop,nop,sackOK], length 0
> > > 21:54:16.731183 IP 10.211.163.215.http > 99.92.208.198.52891: Flags
> > > [R.], seq 0, ack 1148493084, win 0, length 0
> > > 21:54:17.080885 IP 99.92.208.198.52890 > 10.211.163.215.http: Flags 
> > > [S],
> > > seq 2014763367, win 8192, options [mss 1460,nop,wscale
> > > 2,nop,nop,sackOK], length 0
> > > ....{{ sinpage }}....
> > > ^C
> > > 36 packets captured
> > > 36 packets received by filter
> > > 0 packets dropped by kernel
> > >
> > > The server appears to be trying to give a response. (99.92.208.198 
> > > is my
> > > workstation external IP address).  It's like FF can't get the response.
> > > Hmm.
> > Ok. Did you check you can ping?
>
> I answered this in my *first* post.
>
> >   First, routing, second, transport (ISO
> > layers 3, then 4, then 5, then 6, then 7).
> >
> > Instead of firefox, use telnet (from windows or linux), this way:
> >
> > telnet my.ip.addr.ess 80
> >
> > then  write
> >
> > GET /
> > (press ENTER TWICE)
> >
> > You should see html code.
>
>
> Nope, no HTML, or anything else.  Connection reset.  I can still SSH 
> into the box, in case you didn't read that in my OP either.
>
> So SSH, all layers up through 7 are fine.
>
>  port 80 = reset.
Try accessing the web page with lynx or links from the server:
links http://127.0.0.1:8080/

Bill

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