Re: Latency in Telnet, intervlan routing [7:38187]
It may seem obvious but double check the subnet masks on the servers. - Original Message - From: "Mason" To: Sent: Friday, March 15, 2002 12:17 AM Subject: Re: Latency in Telnet, intervlan routing [7:38187] > Ok, so here is the status: > Sniffer traces show that the latency occurs when I do telnet (regardless > using IP or Netbios name) to three specific Unix servers. > If I do telnet to another device on the same subnet, I have no problems. > That eliminates any routing issues, correct ? But what the three servers, > independent of each others have in common... can't understand that one. > > > > > ""Mason"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I do Telnet from a client on VLAN1 and I reach the server just > > fine. VLAN1 is where the server is also connected to. > > I do Telnet from any other VLAN: Telnet takes a long time, then it times > > out. > > > > That tells me it is something in the InterVLAN routing. What would be the > > next step to troubleshoot the problem ? I look into the Cat 5000 > > configuration but I can't see any relevant changes that caused the > problem. > > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, > I > > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38599&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
That was a reverse name lookup problem... fixed. Thanks... you guys are rocking ! ""Tauseef Nagi"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > In the Unix servers, please check for /etc/resolve.conf and see if name > servers are configured correctly. If these Unix servers don't require name > services, please add just their ip addresses to /etc/hosts file and then > check for response time. This is "reverse nam lookup" issue. > > Thanks. > > Tauseef > > ""Mason"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I do Telnet from a client on VLAN1 and I reach the server just > > fine. VLAN1 is where the server is also connected to. > > I do Telnet from any other VLAN: Telnet takes a long time, then it times > > out. > > > > That tells me it is something in the InterVLAN routing. What would be the > > next step to troubleshoot the problem ? I look into the Cat 5000 > > configuration but I can't see any relevant changes that caused the > problem. > > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, > I > > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38495&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
In the Unix servers, please check for /etc/resolve.conf and see if name servers are configured correctly. If these Unix servers don't require name services, please add just their ip addresses to /etc/hosts file and then check for response time. This is "reverse nam lookup" issue. Thanks. Tauseef ""Mason"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I do Telnet from a client on VLAN1 and I reach the server just > fine. VLAN1 is where the server is also connected to. > I do Telnet from any other VLAN: Telnet takes a long time, then it times > out. > > That tells me it is something in the InterVLAN routing. What would be the > next step to troubleshoot the problem ? I look into the Cat 5000 > configuration but I can't see any relevant changes that caused the problem. > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38428&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
Are the telnet client/s in the /etc/hosts file on the UNIX server? I have had similar problems, placing the clients IP address in the /etc/hosts file resolved the latency. KM >From: "Francisco Sedano/Inf-Pronet" >Reply-To: "Francisco Sedano/Inf-Pronet" >To: [EMAIL PROTECTED] >Subject: Re: Latency in Telnet, intervlan routing [7:38187] >Date: Fri, 15 Mar 2002 07:36:01 -0500 > >Maybe the servers you are telnetting to, are trying to resolve the incoming >IP address to a name, and are waiting for the DNS to respond; try to verify >that particular UNIX boxes have correct DNS settings. > > > > > > >"Mason" > >cc: > Enviado por: Asunto: Re: Latency in >Telnet, intervlan routing [7:38187] > >nobody@groupstudy > >.com > > > 15/03/2002 >06:17 > Por >favor, > responda >a > >"Mason" > > > > > > >Ok, so here is the status: >Sniffer traces show that the latency occurs when I do telnet (regardless >using IP or Netbios name) to three specific Unix servers. >If I do telnet to another device on the same subnet, I have no problems. >That eliminates any routing issues, correct ? But what the three servers, >independent of each others have in common... can't understand that one. > > > > >""Mason"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I do Telnet from a client on VLAN1 and I reach the server just > > fine. VLAN1 is where the server is also connected to. > > I do Telnet from any other VLAN: Telnet takes a long time, then it times > > out. > > > > That tells me it is something in the InterVLAN routing. What would be >the > > next step to troubleshoot the problem ? I look into the Cat 5000 > > configuration but I can't see any relevant changes that caused the >problem. > > If I use a Sniffer, I noticed a delta time larger for the Telnet. >However, >I > > don't see any brodcast that could such delay. _ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38379&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
Maybe the servers you are telnetting to, are trying to resolve the incoming IP address to a name, and are waiting for the DNS to respond; try to verify that particular UNIX boxes have correct DNS settings. "Mason" cc: Enviado por: Asunto: Re: Latency in Telnet, intervlan routing [7:38187] nobody@groupstudy .com 15/03/2002 06:17 Por favor, responda a "Mason" Ok, so here is the status: Sniffer traces show that the latency occurs when I do telnet (regardless using IP or Netbios name) to three specific Unix servers. If I do telnet to another device on the same subnet, I have no problems. That eliminates any routing issues, correct ? But what the three servers, independent of each others have in common... can't understand that one. ""Mason"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I do Telnet from a client on VLAN1 and I reach the server just > fine. VLAN1 is where the server is also connected to. > I do Telnet from any other VLAN: Telnet takes a long time, then it times > out. > > That tells me it is something in the InterVLAN routing. What would be the > next step to troubleshoot the problem ? I look into the Cat 5000 > configuration but I can't see any relevant changes that caused the problem. > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38377&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
Ok, so here is the status: Sniffer traces show that the latency occurs when I do telnet (regardless using IP or Netbios name) to three specific Unix servers. If I do telnet to another device on the same subnet, I have no problems. That eliminates any routing issues, correct ? But what the three servers, independent of each others have in common... can't understand that one. ""Mason"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I do Telnet from a client on VLAN1 and I reach the server just > fine. VLAN1 is where the server is also connected to. > I do Telnet from any other VLAN: Telnet takes a long time, then it times > out. > > That tells me it is something in the InterVLAN routing. What would be the > next step to troubleshoot the problem ? I look into the Cat 5000 > configuration but I can't see any relevant changes that caused the problem. > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38351&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Latency in Telnet, intervlan routing [7:38187]
To add, Make sure that subnet masks are all configured properly. Beleive me that could be the problem. Wrong subnet masks are hidden problems that would allow you to do certain thing and deny certain things. It may allow you to ping, but not to telnet. Abbas -Original Message- From: Tauseef Nagi [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 13, 2002 9:22 PM To: [EMAIL PROTECTED] Subject: Re: Latency in Telnet, intervlan routing [7:38187] Here are few things you could look into, 1) Is this a new config.? 2) Did it ever work before? if yes, what changed? 3) Assuming that routing is setup correctly on the Cat5K routing module (if this is being used), (a) do you have the right static routing setup on the server to respond to traffic coming from different network? (b) where is your default gateway point to (as next hop) on your server? (c) If the server is a unix box, do you have any tcp wrappers? any ip-chains? any firewall? 4) If everything checks out OK thus far, check for issues with switch and routing module configuration 5) What are you using to route inter-vlan traffic? is it routing module in Cat5K or is it external router? 6) If it is internal routing module, have you configured the vlan interfaces correctly? 7) Once all the end stations are connected, are the vlan interfaces show as "up" and "up"? 8) How about the ip addressing? are all the configurations falling withing their respective masking bounderies? 9) How about the ACLs? 10) So on and so forth... I hope that somewhere along this path, you'll find the issue. Please do share with us what was the resolution. Tauseef ""Mason"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I do Telnet from a client on VLAN1 and I reach the server just > fine. VLAN1 is where the server is also connected to. > I do Telnet from any other VLAN: Telnet takes a long time, then it times > out. > > That tells me it is something in the InterVLAN routing. What would be the > next step to troubleshoot the problem ? I look into the Cat 5000 > configuration but I can't see any relevant changes that caused the problem. > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38288&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Latency in Telnet, intervlan routing [7:38187]
make sure your route table isnt goofy. also maybe check the arp cache for mac/ip problems. i have seen this happen with a faulty arp cache. i cleared the arp cache, reset the devices, and verify the arp cache again. hope this helps -Original Message- From: Mason [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 13, 2002 9:36 PM To: [EMAIL PROTECTED] Subject: Latency in Telnet, intervlan routing [7:38187] I do Telnet from a client on VLAN1 and I reach the server just fine. VLAN1 is where the server is also connected to. I do Telnet from any other VLAN: Telnet takes a long time, then it times out. That tells me it is something in the InterVLAN routing. What would be the next step to troubleshoot the problem ? I look into the Cat 5000 configuration but I can't see any relevant changes that caused the problem. If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38222&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Latency in Telnet, intervlan routing [7:38187]
Here are few things you could look into, 1) Is this a new config.? 2) Did it ever work before? if yes, what changed? 3) Assuming that routing is setup correctly on the Cat5K routing module (if this is being used), (a) do you have the right static routing setup on the server to respond to traffic coming from different network? (b) where is your default gateway point to (as next hop) on your server? (c) If the server is a unix box, do you have any tcp wrappers? any ip-chains? any firewall? 4) If everything checks out OK thus far, check for issues with switch and routing module configuration 5) What are you using to route inter-vlan traffic? is it routing module in Cat5K or is it external router? 6) If it is internal routing module, have you configured the vlan interfaces correctly? 7) Once all the end stations are connected, are the vlan interfaces show as "up" and "up"? 8) How about the ip addressing? are all the configurations falling withing their respective masking bounderies? 9) How about the ACLs? 10) So on and so forth... I hope that somewhere along this path, you'll find the issue. Please do share with us what was the resolution. Tauseef ""Mason"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I do Telnet from a client on VLAN1 and I reach the server just > fine. VLAN1 is where the server is also connected to. > I do Telnet from any other VLAN: Telnet takes a long time, then it times > out. > > That tells me it is something in the InterVLAN routing. What would be the > next step to troubleshoot the problem ? I look into the Cat 5000 > configuration but I can't see any relevant changes that caused the problem. > If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I > don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38199&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Latency in Telnet, intervlan routing [7:38187]
I do Telnet from a client on VLAN1 and I reach the server just fine. VLAN1 is where the server is also connected to. I do Telnet from any other VLAN: Telnet takes a long time, then it times out. That tells me it is something in the InterVLAN routing. What would be the next step to troubleshoot the problem ? I look into the Cat 5000 configuration but I can't see any relevant changes that caused the problem. If I use a Sniffer, I noticed a delta time larger for the Telnet. However, I don't see any brodcast that could such delay. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38187&t=38187 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
