did my email help? "Sim, CT (Chee Tong)" wrote: > Hi.. Dear all.. thank you for your detailed explaination. Thank you very > much > > I have another question when I doing my work > > Our Sydney office face slowness to access the server in Ultrecht > > The Connection is SYD01--> SIN01--> LON01-->LAMS089 > > yesterday I did a traceroute from SIN01 (100ms) SIN01-->LON01 (410ms) LON01 > --> LAMS089 (420ms) > > it is considered high, I called MCI world com to check the circuit, then > after they rerouted the circuit I checked again today > > I did a traceroute from SIN01 router the round trip time to LON01 (270ms) > LON01 to LAMS089 (280MS) > > But if I do traceroute from SYD01-->SIN01 (100ms) SIN01-->LON01 (410ms) > LON01 --> LAMS089 (420ms) > > Why the time is difference? > > -----Original Message----- > From: James Xie [mailto:[EMAIL PROTECTED]] > Sent: Friday, June 09, 2000 2:39 AM > To: Sim, CT (Chee Tong); 'Bartlett, DS1'; '[EMAIL PROTECTED]' > Subject: Re: telnet, ping, multicast and etc > > At 05:37 PM 06/08/2000 +0800, Sim, CT (Chee Tong) wrote: > >Dear friends, > > > >Can I ask you some basic question, don't laugh at me :P if u just want to > >answer me one of the question, just help me . > > > >1) What is difference between ping and telnet? telnet is using port 23, how > >about PING? which port is that? I understand we can use the access-list > to > >control whether a telnet session can be established, how about ping, Are we > >using the ip route command to whether PING traffic to pass thru? > > Telnet is an application using tcp port 23. > Ping is another application using icmp (a special ip protocol), neither TCP > nor UDP is > involved. Ping uses ICMP packet type echo. > > > > >2) We open a port in Firewall to let user can telnet to a server in remote > >site. Does it mean that we can ping to the server. If not, What should we > >do in order to let user can ping to the server? > > No, you have to open ICMP echo and echo-reply for ping to work. > > > > >3) What is mean by Multicast? I know there is a range of IP for Multicast? > >But when we need it? > > > > I think you are talking about layer 3 multicast. A special range of ip > address > 224.0.0.0-239.0.0.0 are reserved for IP multicasting. For example, any > devices > configured with 224.0.0.5 are OSPF desinated routers. If you want to send > some > IP packets to those routers only, you can address the packet to that > address. > Multicast is also used for multimedia traffic. You can even use it across > the > Internet (MBONE). Multicast can be staticaly/dynaimcally routed. Popular > dynamic > routing protocols including IGMP, CGMP, PIM etc. AppleTalk also supports > multicasting. > > Jim Xie > > > > >Thanks > > > >Sim Chee Tong > > > > > > > > > > > > > >================================================================== > >De informatie opgenomen in dit bericht kan vertrouwelijk zijn en > >is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht > >onterecht ontvangt wordt u verzocht de inhoud niet te gebruiken en > >de afzender direct te informeren door het bericht te retourneren. > >================================================================== > >The information contained in this message may be confidential > >and is intended to be exclusively for the addressee. Should you > >receive this message unintentionally, please do not use the contents > >herein and notify the sender immediately by return e-mail. > > > > > >================================================================== > > > > > >___________________________________ > >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] > > ================================================================== > De informatie opgenomen in dit bericht kan vertrouwelijk zijn en > is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht > onterecht ontvangt wordt u verzocht de inhoud niet te gebruiken en > de afzender direct te informeren door het bericht te retourneren. > ================================================================== > The information contained in this message may be confidential > and is intended to be exclusively for the addressee. Should you > receive this message unintentionally, please do not use the contents > herein and notify the sender immediately by return e-mail. > > ================================================================== > > ___________________________________ > 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:vcard n:Patel;Shetal tel;pager:888-657-7833 tel;cell:201-924-4947 tel;fax:212-675-8668 tel;home:212-675-9300 tel;work:212-675-9300 x-mozilla-html:FALSE url:http://www.sitesmith.com org:www.SiteSmith.com;SM version:2.1 email;internet:[EMAIL PROTECTED] title:Network Site Engineer adr;quoted-printable:;;450 West 15th Steet=0D=0A5th Floor, suite 505;New York;New York;10011;USA note;quoted-printable:=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0D=0ASmarter then the average bear!=0D=0A=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D fn:ShaQ-Cisco Certified Network Associate end:vcard
