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Solaris 7 telnet issue - Sun Solaris

Hi, Just recently an E450 running Solaris 7 at my work has demonstrated a considerable lag when responding to remote pseudo-terminal sessions ( e.g. telnet, rlogin, xterm ...etc). The machine has been patched with current recommended Sun security patches (kernel patch 106541-27). Using snoop on the E450 I can see that the initial request gets to the E450 immediately (here's a dump) ________________________________ 192.168.10.69 -> sc-solsrv-01 ETHER Type=0800 (IP), size = 60 bytes 192.168.10.69 -> sc-solsrv-01 IP D=192.168.10.10 S=192.168.10.69 LEN=44, ID=58799 192.168.10.69 -> sc-solsrv-01 TCP D=23 S=1853 Syn Seq=164513840 Len=0 Win=8192 Options=<mss 1460> 192.168.10.69 -> sc-solsrv-01 TELNET C port=1853 ________________________________ ...

  1. #1

    Default Solaris 7 telnet issue

    Hi,

    Just recently an E450 running Solaris 7 at my work has demonstrated a
    considerable lag when responding to
    remote pseudo-terminal sessions ( e.g. telnet, rlogin, xterm ...etc).
    The machine has been patched with current recommended Sun security patches
    (kernel
    patch 106541-27).
    Using snoop on the E450 I can see that the initial request gets to the E450
    immediately (here's
    a dump)

    ________________________________
    192.168.10.69 -> sc-solsrv-01 ETHER Type=0800 (IP), size = 60 bytes
    192.168.10.69 -> sc-solsrv-01 IP D=192.168.10.10 S=192.168.10.69 LEN=44,
    ID=58799
    192.168.10.69 -> sc-solsrv-01 TCP D=23 S=1853 Syn Seq=164513840 Len=0
    Win=8192 Options=<mss 1460>
    192.168.10.69 -> sc-solsrv-01 TELNET C port=1853
    ________________________________
    sc-solsrv-01 -> 192.168.10.69 ETHER Type=0800 (IP), size = 58 bytes
    sc-solsrv-01 -> 192.168.10.69 IP D=192.168.10.69 S=192.168.10.10 LEN=44,
    ID=37646
    sc-solsrv-01 -> 192.168.10.69 TCP D=1853 S=23 Syn Ack=164513841
    Seq=2320501414 Len=0 Win=8760 Options=<mss 1460>
    sc-solsrv-01 -> 192.168.10.69 TELNET R port=1853
    ________________________________
    192.168.10.69 -> sc-solsrv-01 ETHER Type=0800 (IP), size = 60 bytes
    192.168.10.69 -> sc-solsrv-01 IP D=192.168.10.10 S=192.168.10.69 LEN=40,
    ID=59055
    192.168.10.69 -> sc-solsrv-01 TCP D=23 S=1853 Ack=2320501415
    Seq=164513841 Len=0 Win=8760
    192.168.10.69 -> sc-solsrv-01 TELNET C port=1853

    However another minute elapses before the login prompt is presented on the
    client side. An E3500 running Solaris 8
    at the same site has no such problems. Once a connection is established
    there is no subsequent problems (i.e. response times
    are fine).

    The E450 has suddenly inexplicably demonstrated this problem. To add to the
    confusion some machines on the LAN can connect immediately, whilst others
    exhibit this problem. Initially I thought that this might be an
    auto-negotiation problem and used ndd to modify the /dev/hme driver
    configuration settings - to no avail.I would appreciate any tips anyone
    might have.

    Thanks and regards,
    Andrew


    Andrew Guest

  2. #2

    Default Re: Solaris 7 telnet issue

    On Tue, 30 Sep 2003 13:42:28 +1000, Andrew Tyson <com.au>
    wrote:
     

    Sounds like you might be experiencing an attempted name service lookup
    delay.

    Try adding an entry to the /etc/hosts file on the E450 for 192.168.10.69
    and see if this helps.

    --
    Barton Fisk, SCNA SCSA

    Replace NOSPAM with net to reply via email.
    ---------
    Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
    Barton Guest

  3. #3

    Default Re: Solaris 7 telnet issue

    > Try adding an entry to the /etc/hosts file on the E450 for 192.168.10.69 

    Barton - you're a legend - that's the problem ! Do you know why it would
    have started appearing all of the sudden ?

    Many thanks,
    Andrew


    Andrew Guest

  4. #4

    Default Re: Solaris 7 telnet issue

    Andrew Tyson wrote:
     
    >
    >
    > Barton - you're a legend - that's the problem ! Do you know why it would
    > have started appearing all of the sudden ?[/ref]

    Someone changed or removed a DNS entry? That's one possibility.

    - Logan

    Logan Guest

  5. #5

    Default Re: Solaris 7 telnet issue

    > Someone changed or removed a DNS entry? That's one possibility.

    We resolved the issue by updating the /etc/resolv.conf with the address
    of our DHCP/DNS server.

    The unusual thing is that the /etc/resolv.conf, /etc/nsswitch.conf and
    /etc/hosts
    files have been untouched for months (yet the problem started manifesting
    itself
    last week). We are starting to think that there has been some mod to the
    DNS server(s) of our ISP.

    Thanks and regards,
    Andrew


    Andrew Guest

  6. #6

    Default Re: Solaris 7 telnet issue

    "Andrew Tyson" <com.au> writes: 
    >
    >We resolved the issue by updating the /etc/resolv.conf with the address
    >of our DHCP/DNS server.
    >
    >The unusual thing is that the /etc/resolv.conf, /etc/nsswitch.conf and
    >/etc/hosts
    >files have been untouched for months (yet the problem started manifesting
    >itself
    >last week). We are starting to think that there has been some mod to the
    >DNS server(s) of our ISP.[/ref]

    Almost certainly those slags at Verislime, who added a wildcard entry for the
    root of .com and .net, such that you never get a DNS domain not found error;
    resolving an unknown domain always gets you an entry at Verislime.

    --
    "The road to Paradise is through Intercourse."
    The uk.transport FAQ; http://www.huge.org.uk/transport/FAQ.html
    [email me at huge [at] huge [dot] org [dot] uk]


    Huge Guest

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