Date: Sun, 12 Feb 2006 12:51:24 +0000 From: Brian Candler <B.Candler@pobox.com> To: GiZmen <gizmen@zion.vsip.pl> Cc: net@freebsd.org Subject: Re: fastforward problem Message-ID: <20060212125124.GA20369@uk.tiscali.com> In-Reply-To: <20060211163533.GA87353@blurp.pl> References: <20060211163533.GA87353@blurp.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Feb 11, 2006 at 05:35:33PM +0100, GiZmen wrote:
> I would like to use fastforward option on my freebsd 6.0-stable
> box. But i have strange problem with it. My box is a router for LAN
> with IP visible to internet. I am managinc C class network.
> When i turn on fastforward option any of the computers in my network
> can't open google.com page. This option is quite good because i have
> quite a lot interrupts and this option lower this about half.
> Could anyone tell me why i can't open google.com page ?
> I have tested different pages and i don't have such problem only with
> google.
Just saying "I can't see google.com" is not a good diagnosis of the problem.
If it's your job to manage a router, then you need to be able to do lower-
level tests to isolate the problem.
Check each of the components in turn:
(1) can my client resolve google.com in the DNS?
If the client is some sort of Unix then try
$ nslookup google.com
You should see a response such as:
Non-authoritative answer:
Name: google.com
Address: 72.14.207.99
Name: google.com
Address: 64.233.187.99
Name: google.com
Address: 64.233.167.99
(2) can my client ping these addresses? That is, is there layer 3 network
reachability between my network and theirs?
$ ping 72.14.207.99
PING 72.14.207.99 (72.14.207.99): 56 data bytes
64 bytes from 72.14.207.99: icmp_seq=1 ttl=238 time=133.730 ms
64 bytes from 72.14.207.99: icmp_seq=2 ttl=237 time=133.179 ms
64 bytes from 72.14.207.99: icmp_seq=3 ttl=238 time=133.316 ms
64 bytes from 72.14.207.99: icmp_seq=4 ttl=237 time=133.396 ms
^C
--- 72.14.207.99 ping statistics ---
5 packets transmitted, 4 packets received, 20% packet loss
round-trip min/avg/max/stddev = 133.179/133.405/133.730/0.203 ms
(3) what happens when I open a TCP/IP connection to port 80, and manually
fetch a HTTP page?
$ telnet 72.14.207.99 80
Trying 72.14.207.99...
Connected to 72.14.207.99.
Escape character is '^]'.
GET / HTTP/1.0
Host: google.com
<<<<< end with a blank line
HTTP/1.0 301 Moved Permanently
Location: http://www.google.com/
Set-Cookie: PREF=ID=f811e9355f349c08:TM=1139748428:LM=1139748428:S=UhZOEU98p2mnw_H0; expires=Sun, 17-Jan-2038 19:14:07 GMT; path=/; domain=.google.com
Content-Type: text/html
Server: GWS/2.1
Content-Length: 219
Date: Sun, 12 Feb 2006 12:47:08 GMT
Connection: Keep-Alive
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>
Connection closed by foreign host.
OK, that's fine. google.com has redirected me to www.google.com. So try the
whole process again with www.google.com instead of google.com
Brian.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060212125124.GA20369>