Ping response between subnets slow
Hi Everybody, Need some help on the following problem I have 2 subnets configured on my LAN say ( x.x.1.0 and x.x.2.0 )with a SM of 255.255.255.0. There are 2 Catalyst switches ( each one on a different subnet) The router is configured with a primary and a secondary address on the ethernet port say x.x.1.1 and x.x.2.1 When I ping a station on one subnet to another and viceversa the response time is very high (sometimes upto 80ms) while the response time while pinging in the same subnet is less than 10ms. Need some clues on the possible reasons for this Thanks & Regards Amit __ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping response between subnets slow
Hi, 10 ms seems high on a switched network. I assume that both networks (Switches) have a trunk between each other and from one switch back to the router if you are using VLAN's. Check your ethernet interface on your router. See what traffic it is doing. Check for collisions, Late collisions, CRC's. Check the port on the switch connecting to the router. Make sure the aggree on the port speed (they will or no comms) and the duplex settings (the most common problem). DO NOT LEAVE THE SWITCH IN AUTO NEGOTIATE MODE. Just some thoughts. Teunis Hobart, Tasmania Australia On Tuesday, January 02, 2001 at 05:25:17 AM, Amit Gupta wrote: > Hi Everybody, > > Need some help on the following problem > > I have 2 subnets configured on my LAN say ( x.x.1.0 > and x.x.2.0 )with a SM of 255.255.255.0. > There are 2 Catalyst switches ( each one on a > different subnet) > > The router is configured with a primary and a > secondary address on the ethernet port say x.x.1.1 and > x.x.2.1 > > When I ping a station on one subnet to another and > viceversa the response time is very high (sometimes > upto 80ms) while the response time while pinging in > the same subnet is less than 10ms. > > Need some clues on the possible reasons for this > > > Thanks & Regards > > Amit > > __ > Do You Yahoo!? > Yahoo! Photos - Share your holiday photos online! > http://photos.yahoo.com/ > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping response between subnets slow
What about the times when you ping from switch to switch? Is it slow when you try that? In a message dated 1/2/01 6:10:33 PM Eastern Standard Time, [EMAIL PROTECTED] writes: > Hi, > > 10 ms seems high on a switched network. > > I assume that both networks (Switches) have a trunk between each other and > from one switch back to the router if you are using VLAN's. > > Check your ethernet interface on your router. See what traffic it is > doing. Check for collisions, Late collisions, CRC's. > > Check the port on the switch connecting to the router. Make sure the > aggree on the port speed (they will or no comms) and the duplex settings > (the most common problem). DO NOT LEAVE THE SWITCH IN AUTO NEGOTIATE MODE. > > > Just some thoughts. > > Teunis > Hobart, Tasmania > Australia > > > On Tuesday, January 02, 2001 at 05:25:17 AM, Amit Gupta wrote: > > > Hi Everybody, > > > > Need some help on the following problem > > > > I have 2 subnets configured on my LAN say ( x.x.1.0 > > and x.x.2.0 )with a SM of 255.255.255.0. > > There are 2 Catalyst switches ( each one on a > > different subnet) > > > > The router is configured with a primary and a > > secondary address on the ethernet port say x.x.1.1 and > > x.x.2.1 > > > > When I ping a station on one subnet to another and > > viceversa the response time is very high (sometimes > > upto 80ms) while the response time while pinging in > > the same subnet is less than 10ms. > > > > Need some clues on the possible reasons for this > > > > > > Thanks & Regards > > > > Amit > Mark Zabludovsky ~ CCNA, CCDA, 1/2-NP [EMAIL PROTECTED] "Even if I knew I had only 1 more week to live, I would still schedule my CCIE lab. I would just have to work a little harder I guess. After all, without any goals in life, I'm dead already." ~Mark Zabludovsky~ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping response between subnets slow
One thing you can also try is to ping both interfaces on the router from one of the hosts to see if it slows over the router. If it slows between the .1 interfaces then you may be running way to much information over the router with an access-list that is too complicated for a low end router (or one that is low on memory.) More then likely Tony's suggestion will fix the issue from what i have seen. Rick Thompson --- Tony van Ree <[EMAIL PROTECTED]> wrote: > Hi, > > 10 ms seems high on a switched network. > > I assume that both networks (Switches) have a trunk > between each other and from one switch back to the > router if you are using VLAN's. > > Check your ethernet interface on your router. See > what traffic it is doing. Check for collisions, > Late collisions, CRC's. > > Check the port on the switch connecting to the > router. Make sure the aggree on the port speed > (they will or no comms) and the duplex settings (the > most common problem). DO NOT LEAVE THE SWITCH IN > AUTO NEGOTIATE MODE. > > Just some thoughts. > > Teunis > Hobart, Tasmania > Australia > > > On Tuesday, January 02, 2001 at 05:25:17 AM, Amit > Gupta wrote: > > > Hi Everybody, > > > > Need some help on the following problem > > > > I have 2 subnets configured on my LAN say ( > x.x.1.0 > > and x.x.2.0 )with a SM of 255.255.255.0. > > There are 2 Catalyst switches ( each one on a > > different subnet) > > > > The router is configured with a primary and a > > secondary address on the ethernet port say x.x.1.1 > and > > x.x.2.1 > > > > When I ping a station on one subnet to another and > > viceversa the response time is very high > (sometimes > > upto 80ms) while the response time while pinging > in > > the same subnet is less than 10ms. > > > > Need some clues on the possible reasons for this > > > > > > Thanks & Regards > > > > Amit > > > > __ > > Do You Yahoo!? > > Yahoo! Photos - Share your holiday photos online! > > http://photos.yahoo.com/ > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to > [EMAIL PROTECTED] > > > > > > > -- > www.tasmail.com > > > _ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Ping response between subnets slow
The Response time of pinging from switch to switch is not slow > -Original Message- > From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]] > Sent: Wednesday, January 03, 2001 8:16 AM > To: [EMAIL PROTECTED] > Subject: Re: Ping response between subnets slow > > What about the times when you ping from switch to switch? Is it slow when > you > try that? > > In a message dated 1/2/01 6:10:33 PM Eastern Standard Time, > [EMAIL PROTECTED] writes: > > > > Hi, > > > > 10 ms seems high on a switched network. > > > > I assume that both networks (Switches) have a trunk between each other > and > > from one switch back to the router if you are using VLAN's. > > > > Check your ethernet interface on your router. See what traffic it is > > doing. Check for collisions, Late collisions, CRC's. > > > > Check the port on the switch connecting to the router. Make sure the > > aggree on the port speed (they will or no comms) and the duplex settings > > > (the most common problem). DO NOT LEAVE THE SWITCH IN AUTO NEGOTIATE > MODE. > > > > > > Just some thoughts. > > > > Teunis > > Hobart, Tasmania > > Australia > > > > > > On Tuesday, January 02, 2001 at 05:25:17 AM, Amit Gupta wrote: > > > > > Hi Everybody, > > > > > > Need some help on the following problem > > > > > > I have 2 subnets configured on my LAN say ( x.x.1.0 > > > and x.x.2.0 )with a SM of 255.255.255.0. > > > There are 2 Catalyst switches ( each one on a > > > different subnet) > > > > > > The router is configured with a primary and a > > > secondary address on the ethernet port say x.x.1.1 and > > > x.x.2.1 > > > > > > When I ping a station on one subnet to another and > > > viceversa the response time is very high (sometimes > > > upto 80ms) while the response time while pinging in > > > the same subnet is less than 10ms. > > > > > > Need some clues on the possible reasons for this > > > > > > > > > Thanks & Regards > > > > > > Amit > > > > > Mark Zabludovsky ~ CCNA, CCDA, 1/2-NP > [EMAIL PROTECTED] > > "Even if I knew I had only 1 more week to live, I would still > schedule > my CCIE lab. I would just have to work a little harder I guess. After all, > > without any goals in life, I'm dead already." >~Mark Zabludovsky~ > > _ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Ping response between subnets slow
Hi Amit, I replied to your question off line yesterday let me know if you got it. It was long winded but went into a number of scenarios you might check. The response times between the switches will be fine the problem seems to be the traffic going in and out of the router port based on what you sent me. The idea behind what I sent you is to avoid local traffic having to be handled by the router. As it appears a lot of the traffic hitting your router ethernet is just being turned around and being sent back out. This will cause the delays you were worried about. Teunis, Hobart, Tasmania Australia On Wednesday, January 03, 2001 at 09:43:45 AM, Amit Gupta (EHPT) IS-IT wrote: > The Response time of pinging from switch to switch is not slow > > > -Original Message- > > From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]] > > Sent: Wednesday, January 03, 2001 8:16 AM > > To: [EMAIL PROTECTED] > > Subject: Re: Ping response between subnets slow > > > > What about the times when you ping from switch to switch? Is it slow when > > you > > try that? > > > > In a message dated 1/2/01 6:10:33 PM Eastern Standard Time, > > [EMAIL PROTECTED] writes: > > > > > > > Hi, > > > > > > 10 ms seems high on a switched network. > > > > > > I assume that both networks (Switches) have a trunk between each other > > and > > > from one switch back to the router if you are using VLAN's. > > > > > > Check your ethernet interface on your router. See what traffic it is > > > doing. Check for collisions, Late collisions, CRC's. > > > > > > Check the port on the switch connecting to the router. Make sure the > > > aggree on the port speed (they will or no comms) and the duplex settings > > > > > (the most common problem). DO NOT LEAVE THE SWITCH IN AUTO NEGOTIATE > > MODE. > > > > > > > > > Just some thoughts. > > > > > > Teunis > > > Hobart, Tasmania > > > Australia > > > > > > > > > On Tuesday, January 02, 2001 at 05:25:17 AM, Amit Gupta wrote: > > > > > > > Hi Everybody, > > > > > > > > Need some help on the following problem > > > > > > > > I have 2 subnets configured on my LAN say ( x.x.1.0 > > > > and x.x.2.0 )with a SM of 255.255.255.0. > > > > There are 2 Catalyst switches ( each one on a > > > > different subnet) > > > > > > > > The router is configured with a primary and a > > > > secondary address on the ethernet port say x.x.1.1 and > > > > x.x.2.1 > > > > > > > > When I ping a station on one subnet to another and > > > > viceversa the response time is very high (sometimes > > > > upto 80ms) while the response time while pinging in > > > > the same subnet is less than 10ms. > > > > > > > > Need some clues on the possible reasons for this > > > > > > > > > > > > Thanks & Regards > > > > > > > > Amit > > > > > > > > > Mark Zabludovsky ~ CCNA, CCDA, 1/2-NP > > [EMAIL PROTECTED] > > > > "Even if I knew I had only 1 more week to live, I would still > > schedule > > my CCIE lab. I would just have to work a little harder I guess. After all, > > > > without any goals in life, I'm dead already." > >~Mark Zabludovsky~ > > > > _ > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Ping response between subnets slow
Hi Tony, Yes you were correct. There are a large number of packets crossing the subnet. This is think creates a bottleneck on the ethernet port on the router. The Ping response within the same subnet also was badly affected.( I could see a lot of users coming towards me... so Rebooting the router saved me temporarily. could enabling something like ip route-cache on the router help. Even pinging from the router to machines on either of the subnets gave this output ping xxx.xxx.1.76 Sending 5, 100-byte ICMP Echos to xxx.xxx.1.76, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 24/41/52 ms #ping xxx.xxx.2.199 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to xxx.xxx.2.199, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 36/48/56 m Need your suggestions Thanks & regards Amit --- Tony van Ree <[EMAIL PROTECTED]> wrote: > Hi Amit, > > At the time you experience the slowness log into > your router and check the traffic levels going into > and out of your Ethernet port. Look also for > broadcast errors etc. I recommend you clear the > counters before you start. note any abnormalities. > > If you notice high levels of error free taffic then > maybe put ip accounting on the ethernet > router#conf t > router#(config)int e 0 (or whatever) > router#(config-if)ip account > router#(config-if) > router# > wait 30 seconds > router#sh ip account > > This will show you who is doing the traffic out of > your ethernet. You may notice high packet rates > between your subnets. If so this is what you need > to sort. > > If you like capture the screen showing your ethernet > and send it to me. > > Secondly you may need to look at your switches. > What sort are they? Let me know. > > Here are just some little trouble shooting ideas > > Teunis > Hobart, Tasmania > Australia > > On Tuesday, January 09, 2001 at 05:22:51 AM, Amit > Gupta wrote: > > > Hi Tony, > > > > I am sensing something abnormal on the network. > > During certain times of the day a ping response to > the > > router's ethernet interface say xxx.xxx.1.1 from a > > station in the same subnet is also taking 60-80ms > > > > Need your help on this > > > > Regards > > > > Amit > > > > > > --- Tony van Ree <[EMAIL PROTECTED]> wrote: > > > Hi Amit, > > > > > > If you are using > > > xxx.xxx.1.0 and xxx.xxx.2.0 the 255.255.254.0 > subnet > > > is not going to be any good. If you are using > > > "private addressing" then 255.255.252.0 will be > ok. > > > > > > It is best you have your addresses designed to > fit > > > nicely into the subnet boundaries. eg > xxx.xxx.0.0 , > > > xxx.xxx.1.0 or xxx.xxx.2.0, xxx.xxx.3.0. I'm > sure > > > you'll see what I mean. > > > > > > Having to two network cards in your server is a > good > > > idea then pointing each network to the cards. > This > > > will allow easier conversion into VLAN's at some > > > later point. > > > > > > All you should need to do is install the second > card > > > and configure it to point with a gateway address > the > > > same as the clients on the second network. DO > NOT > > > HAVE A DEFAULT GATEWAY ON THE SECOND CARD. > > > > > > When installed you should find the xxx.xxx.2.0 > > > address will point stuff for the xxx.xxx.2.0 > network > > > out that card. Once again to avoid confusion it > is > > > best to have the clients on the second LAN > pointing > > > to the second card in the first place. > > > > > > Should you go to VLAN's? > > > > > > Well it will take a little reconfig less than an > > > hour I should imagine. Just this week I did > similar > > > with a Technical College here where I am. In > this > > > case we really wanted to keep the students away > from > > > the staff LAN's. Control was also required to > stop > > > unlimited access to the Internet for students. > > > > > > Solution, > > > > > > 2 VLAN's the staff on a public network > > > ppp.ppp.pp0.000/23 and the students on a private > > > xxx.xxx.xx0.000/23. This allows some 500 > devices on > > > each network. In this case there are some 30 > > > switches involved. The servers and access > switches > > > (mainly Cat1900) come back to a a Cat5000. Some > of > > > the servers have two network cards one to each > > > network. The router in this case is not the > normal > > > run of the mill router so the config here is > > > different but what would do fine is running ISL > > > trunking back to the switch from the router then > > > have 2 sub interfaces under the Ethernet port > (one > > > for each VLAN). > > > > > > This allows access lists and individual control > for > > > each network. > > > > > > As a form of traffic control whilst the staff > card > > > in the server has a 100Meg Full duplex setting > the > > > second card in the server has a 10Meg/Half on > the > > > student LAN. This restricts the utilisation by > the > > > students. > > > > > > As you can see the are a mult
