iptables fubared?

[Mark Space]

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.