Linksys connectivity problem using 2.6.0-test4

Linksys connectivity problem using 2.6.0-test4

[Fawad Halim]

Hi,
    I'm having trouble connecting to the http based admin ports on my 
LinkSys VPN router (BEFVP41) using the 2.6.0-test4 kernel on Redhat 9. 
The connectivity works fine with 2.4.20-19.9 from Redhat as well as 
other 2.4.x kernels. With the 2.6 kernel, I can ping the machine, but 
can't connect to the http ports (80, 8080)

# uname -a
Linux chuckie 2.6.0-test4-fh1 #1 Mon Sep 1 05:43:07 CDT 2003 i686 athlon 
i386 GNU/Linux

# nmap 192.168.3.1

Starting nmap 3.30 ( http://www.insecure.org/nmap/ ) at 2003-09-10 06:42 CDT
Interesting ports on 192.168.3.1:
(The 1642 ports scanned but not shown below are in state: closed)
Port       State       Service
80/tcp     open        http
8080/tcp   open        http-proxy

Nmap run completed -- 1 IP address (1 host up) scanned in 2.468 seconds

# ping -c 1 192.168.3.1
PING 192.168.3.1 (192.168.3.1) 56(84) bytes of data.
64 bytes from 192.168.3.1: icmp_seq=1 ttl=149 time=1.44 ms

--- 192.168.3.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.448/1.448/1.448/0.000 ms

# telnet 192.168.3.1 80
Trying 192.168.3.1...
telnet: connect to address 192.168.3.1: Connection refused

The VPN router is doing NAT correctly for both kernels, and connectivity 
to services other than the router itself is fine.

I am not sure where to even begin debugging this problem.

Regards
-fawad

Re: Linksys connectivity problem using 2.6.0-test4

[Fawad Halim]

Dmitry, Thanks for the pointer. In 2.6, apparently ECN is enabled by
default. Disabling it did the trick.

-fawad

> On Wednesday 10 September 2003 06:46 am, Fawad Halim wrote:
>> Hi,
>>     I'm having trouble connecting to the http based admin ports on my
>> LinkSys VPN router (BEFVP41) using the 2.6.0-test4 kernel on Redhat 9.
>> The connectivity works fine with 2.4.20-19.9 from Redhat as well as
>> other 2.4.x kernels. With the 2.6 kernel, I can ping the machine, but
>> can't connect to the http ports (80, 8080)
>>
> <skip>
>> # telnet 192.168.3.1 80
>> Trying 192.168.3.1...
>> telnet: connect to address 192.168.3.1: Connection refused
>>
>> The VPN router is doing NAT correctly for both kernels, and connectivity
>> to services other than the router itself is fine.
>>
>
> Make sure that you not using ECN - my Linksys refuses incoming
> connections with ECN. Passes them tohrough just fine, tough.
>
> Dmitry
>

Re: Linksys connectivity problem using 2.6.0-test4

[Dmitry Torokhov]

On Wednesday 10 September 2003 06:46 am, Fawad Halim wrote:
> Hi,
>     I'm having trouble connecting to the http based admin ports on my
> LinkSys VPN router (BEFVP41) using the 2.6.0-test4 kernel on Redhat 9.
> The connectivity works fine with 2.4.20-19.9 from Redhat as well as
> other 2.4.x kernels. With the 2.6 kernel, I can ping the machine, but
> can't connect to the http ports (80, 8080)
>
<skip>
> # telnet 192.168.3.1 80
> Trying 192.168.3.1...
> telnet: connect to address 192.168.3.1: Connection refused
>
> The VPN router is doing NAT correctly for both kernels, and connectivity
> to services other than the router itself is fine.
>

Make sure that you not using ECN - my Linksys refuses incoming
connections with ECN. Passes them tohrough just fine, tough.

Dmitry