[Bug 228953] Re: telnet disconnects
--FROM UBUNTU USERS MAILING LIST-- > I can understand why you presented a png of a filtered pcap. I > agree it looks strange but there's not enough information for > analysis. > > I use this T61 on routers and switches all the time, and mostly > under X rather than text mode, but the switches and routers I > talk to are mostly Ciscos and set up to "more" at the end of > each page. > > It sounds like you suspect your T61 of not being able to display > the text as fast as the switch can send it. This is very likely > as displaying text in a font under X windows is a lot more work > then displaying text in text mode. Try the telnet from a text > mode console for comparison. (Usually ctrl-alt-F1 will get you > to a text console and ctrl-alt-F7 will get you back into X). > > --Mike Bird > --MY REPLY-- Hi Mike, First of all thank you for mail. I also thought it was related to display speed! But this doesn't seem to be the issue. I tried from the the TTYs Ctrl+Alt+F1-F6 and the issue is still the same. I get disconnected. CPU doesn't spike while displaying the configuration, and my T61 comes with a 512MB nVidia (probably like yours does) and I... I am really confused :~ While operating with CISCO switches I don't have any problems whatsoever --surely related to the --MORE-- at the end of each page. I can hold down the spacebar so that it 'kinda' drops the config all at once and I still remain online with the switch. I know the PNG with the filtered pcap doesn't seem that complete, but Bertelsmann has a very strict policy about data privacy, so I am unable to post the complete pcap. If someone would have a public Alcatel switch where I could connect to, I'd be more than happy to post the complete pcap. To be honest, we took a look at the complete pcap with my networking colleagues (real gurus) and found nothing suspicious. If there is something else, anything, I can collaborate with, please let me know! KR, Harald -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
Summary of discussion: Harald will sniff a session to the switch with Windows and with Ubuntu, then will look for differences. Although MTU might be affecting, I am not sure which direction is sending most data (the sniffer snapshot only shows zero-window packets, and it is unclear why they are being sent; there is a suggestion of single-byte packets from the switch -- port 3268 is the switch; the seq/ack values are sort of weird...). -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
discussed the issue with Harald on #ubuntu-bugs. This does not sound like a bug on telnet, or TCP/IP, but I will keep it open for further discussions. Leaving it for the moment without a package (since we do not know yet which, if any, would apply). ** Changed in: ubuntu Importance: Undecided => Medium Assignee: (unassigned) => hggdh (hggdh2) Status: New => Incomplete -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
** Description changed: I work in networking and use telnet frequently. Most switches I telnet have very long configurations (+500 lines) which, in the case of Alcatel, are not divided by pages (like when you get "--MORE--" at the end of each page and hit the spacebar for the next page, just like when you issue the command " | more"). What happens is that when it reaches the line 300-400 aprox. I get disconnected. This happens always, no matter what telnet client I use. I tried the following telnet clients: - "telnet" from the console - "putty" for linux (GUI) - run "telnet" from cmd within a VM. Tried both VMWare and VirtualBox. Why this happens? I can observe (comparing to Windows native) that the configuration is arriving very slow to my system when running ubuntu, as if I was limiting my bandwidth to 4800bps. A configuration of about 500 lines will take about 8-12 seconds to show on my screen, just before it disconnects, when on Windows it will take less than a second. My ubuntu release: Description:Ubuntu 7.10 Release:7.10 Version of telnet I am using: telnet: Installed: 0.17-35ubuntu1 Candidate: 0.17-35ubuntu1 Version table: *** 0.17-35ubuntu1 0 500 http://ftp.hosteurope.de gutsy/main Packages 100 /var/lib/dpkg/status UPDATE: A few days after performing the packet capture, I had to travel to the place this switch was located. While on site, I had no issues performing telnet on the switch. I therefore assume all this is related to latency--a very small one, as we only have 13ms to this site. Its been several days since I posted this bug... why haven't I received at least a confirmation that this is being viewed/processed or whatever? I really need this fixed if I want to keep this OS. Thank you! + + UPDATE2: Suspecting this might be related to the video driver (currently + using the "ENVY" driver) due to screen refresh or some other screen- + related setting, I uninstalled the driver and used the standard low-res + default ubuntu driver and I am still experiencing the same issue. -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
** Description changed: I work in networking and use telnet frequently. Most switches I telnet have very long configurations (+500 lines) which, in the case of Alcatel, are not divided by pages (like when you get "--MORE--" at the end of each page and hit the spacebar for the next page, just like when you issue the command " | more"). What happens is that when it reaches the line 300-400 aprox. I get disconnected. This happens always, no matter what telnet client I use. I tried the following telnet clients: - "telnet" from the console - "putty" for linux (GUI) - run "telnet" from cmd within a VM. Tried both VMWare and VirtualBox. Why this happens? I can observe (comparing to Windows native) that the configuration is arriving very slow to my system when running ubuntu, as if I was limiting my bandwidth to 4800bps. A configuration of about 500 lines will take about 8-12 seconds to show on my screen, just before it disconnects, when on Windows it will take less than a second. My ubuntu release: Description:Ubuntu 7.10 Release:7.10 Version of telnet I am using: telnet: Installed: 0.17-35ubuntu1 Candidate: 0.17-35ubuntu1 Version table: *** 0.17-35ubuntu1 0 500 http://ftp.hosteurope.de gutsy/main Packages 100 /var/lib/dpkg/status + + UPDATE: A few days after performing the packet capture, I had to travel + to the place this switch was located. While on site, I had no issues + performing telnet on the switch. I therefore assume all this is related + to latency--a very small one, as we only have 13ms to this site. + + Its been several days since I posted this bug... why haven't I received + at least a confirmation that this is being viewed/processed or whatever? + + I really need this fixed if I want to keep this OS. Thank you! -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
After performing a packet capture, I realized that I am sending "Zero Window" and "Zero Window Probe" packets, meaning (probably) that my Lenovo T61 (Dual-Core with 3GB of RAM) is "slower" in processing the packets than a simple Telnet session with a Network Switch. Being the above hard to believe, I ask for guidance on properly diagnosing this issue. I am attaching the filtered result of the Wireshark session where the ZeroWindow packets are shown. If further info is required, please let me know. P.S.: My notebook has dual-boot with Windows XP. When booting with Windows XP, this behaviour is not encountered. KR, Harald.- ** Attachment added: "Wireshark Session (filtered)" http://launchpadlibrarian.net/14488484/Screenshot-telnet_session.libcap%20-%20Wireshark.png -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 228953] Re: telnet disconnects
** Attachment added: "the telnet client of ubuntu in /usr/bin/telnet" http://launchpadlibrarian.net/14420929/telnet -- telnet disconnects https://bugs.launchpad.net/bugs/228953 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
