Network works one way only

From: Dr. Oliver Muth (Dr.O.Muth_at_gmx.de)
Date: 04/29/04

  • Next message: Hermes: "Re: PPP on demand" 
    Date: Thu, 29 Apr 2004 18:05:04 +0200

    Hi!

    My network works just in one-way mode:
    To write to the file server works, but to read from it is real hard.

    For testing purposes I connected now my laptop directly with the server.
    (Ethernet cable, no Switch, 100Mbs).
    Server and Laptop run Debian sarge (testing), kernel 2.4.25.

    Samba:
    Write to server: 4,4 MB/s
    Read from server: 16 KB/s !!

    nfs V3 (via tcp):
    Write to server: 187 KB/s
    Read from Server: 4 KB/s !!

    nfs V3 (via udp, wsize=rsize=8192)
    Write to server: 290 KB/s
    Read from server: 0 KB/s stalls!!
    Log message: server not responding, still trying.

    I am (obviously ;-) ) no network expert, but since reading from the server
    with nfs/udp did not work at all, I asked Ethereal.
    Result:
    One of my computers swallows all fragmented nfs-Packets.
    The server is convinced of having sent them, but the client never receives them.
    Why?

    And why are there these enormous differences between reading and writing even
    with the TCP connection?
    (No, I did not use a floppy as test media ;-) )

    System description:
    Server hardware:
    Athlon 2200+ on ASROCK K7VT2 with VIA Rhine II Ethernet on board
    Client hardware:
    IPC-Laptop with SiS 900 Ethernet on board
    (but other clients make no difference...)
    NO firewall, iptables are empty, policies on ACCEPT.
    If helpful I can post an output of ethereal or nfsstat.

    Any help is appreciated!

    Oliver

  • Next message: Hermes: "Re: PPP on demand"

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