Cho,
Erik is quite correct about some of the possible problems. You may,
however, be getting filtered deliberately. There have been some
posts on the North American Network Operators Group (NANOG) that a
few service providers have started blocking the .kr, .tw, and some
other domains due to an extremely high incidence of spam and hacker
attacks apparently originating there.
I don't agree with that policy, and I don't think it's widespread.
But if the basic tests don't show the problem, mailing the
postmasters or webmasters at that site, preferably from a different
domain, is a good idea. You might not be getting ICMP destination
unreachable or administratively prohibited because you are being
blocked on a firewall.
Do check carefully that there is no hacking or spam activity on the
problem network.
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
> If you can trace and ping the sites, it sounds like your address
>blocks may be filtered at the destination or more likely, your L4
>switches. First try telnetting to port 80 from both sides of the
>switches, if you suspect it is they're side, run a ping against the
>sites checking port 80 and varying your source addresses.
>Also, first try pinging from the troublesome source IP's with large
>packets, it could be a misconfigured circuit dropping your HTTP
>requests but passing the tiny ping packets, I've seen this before on
>x.25 links and could happen at any layer 2-3 device.
>
>Erik Mintz
>Director, IT operations
>Crosslinks systems
>1 Silicon alley plaza
>New York, NY
>10038
>[EMAIL PROTECTED]
>
>
>
>- -----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Á¶ ±¤ ¼®
>Sent: Friday, July 14, 2000 5:16 AM
>To: [EMAIL PROTECTED]
>Subject: About accessing to some sites
>
>
>This is kornet in korea. The kornet is one of ISPs in our nation.
>Recently we have had difficulty in getting to some sites like
>www.chez.com,www.com,www.yahoo.co.uk
>www.blizard.com,www.polarismech.com.
>Mostly we have got lots of calls from the customers who use ADSL
>connection
>with source ip address 211.38.0.0. they say they can traceroute
>and
>ping to the destinations but can't open
>the sites on the web. With the ip space 168.126.0.0 that we
>currently
>use, we also can reach to
>the sites but we can't open the two sites www.chez.com,www.com on the
>web.
>For your reference, our customers go through L4 switches and Net
>caches.
>we need your help!! if you need further more question, feel free to
>ask us
>!!!
>
>from cho
>
>
>___________________________________
>UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>FAQ, list archives, and subscription info: http://www.groupstudy.com
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>-----BEGIN PGP SIGNATURE-----
>Version: PGP 6.5
>
>iQA/AwUBOW81/JYKdIYZnR1XEQLSXgCcCRq/4qAZrhLGYGU88QNsYcNgxqkAoMSj
>Ir0ASyJBxbpTgoI7Xnizjula
>=/znK
>-----END PGP SIGNATURE-----
>
>___________________________________
>UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
>FAQ, list archives, and subscription info: http://www.groupstudy.com
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
