POP3 networking problem.

From: DoesntMatter (Yes_at_I.Do)
Date: 04/07/04

  • Next message: Intelligent Guy: "Re: cannot connect to internet (more information )" 
    Date: Wed, 07 Apr 2004 12:15:49 GMT

    I have a linux pop3 server running into a virtual machine (vmware).
    The machine , ip 192.168.56.128 ,
    is connected to a 192.168.56.0 network.
    Via a virtual NAT device it shares also my host network,
    where my host has an address 192.168.1.101.

    When my host (running xp) does a telnet 192.168.56.128 110 ,
    the response is immediate. Packets captured via ethereal show
    the expected behaviour :

    > Frame 1 (42 bytes on wire, 42 bytes captured)
    > Ethernet II, Src: 00:50:56:c0:00:08, Dst: ff:ff:ff:ff:ff:ff
    > Address Resolution Protocol (request)
    >
    > Frame 2 (42 bytes on wire, 42 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:c0:00:08
    > Address Resolution Protocol (reply)
    >
    > Frame 3 (62 bytes on wire, 62 bytes captured)
    > Ethernet II, Src: 00:50:56:c0:00:08, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.56.1 (192.168.56.1), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1126 (1126), Dst Port: pop3 (110), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 4 (62 bytes on wire, 62 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:c0:00:08
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.56.1 (192.168.56.1)
    > Transmission Control Protocol, Src Port: pop3 (110), Dst Port: 1126 (1126), Seq: 0, Ack: 1, Len: 0
    >
    > Frame 5 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:c0:00:08, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.56.1 (192.168.56.1), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1126 (1126), Dst Port: pop3 (110), Seq: 1, Ack: 1, Len: 0
    >
    > Frame 6 (74 bytes on wire, 74 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:c0:00:08
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.56.1 (192.168.56.1)
    > Transmission Control Protocol, Src Port: 32788 (32788), Dst Port: auth (113), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 7 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:c0:00:08, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.56.1 (192.168.56.1), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: auth (113), Dst Port: 32788 (32788), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 8 (106 bytes on wire, 106 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:c0:00:08
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.56.1 (192.168.56.1)
    > Transmission Control Protocol, Src Port: pop3 (110), Dst Port: 1126 (1126), Seq: 1, Ack: 1, Len: 52
    > Post Office Protocol
    >
    > Frame 9 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:c0:00:08, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.56.1 (192.168.56.1), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1126 (1126), Dst Port: pop3 (110), Seq: 1, Ack: 53, Len: 0

    When I do however a telnet 192.168.1.101 110 (which is by the way used
    by other machines on my local network) I have a long delay before there
    comes finally a prompt. We are speaking about half a minute or so.

    > Frame 1 (42 bytes on wire, 42 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: ff:ff:ff:ff:ff:ff
    > Address Resolution Protocol (request)
    >
    > Frame 2 (42 bytes on wire, 42 bytes captured)
    > Ethernet II, Src: 00:50:56:e9:3e:1d, Dst: 00:0c:29:0a:2a:f0
    > Address Resolution Protocol (reply)
    >
    > Frame 3 (342 bytes on wire, 342 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e9:3e:1d
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.56.254 (192.168.56.254)
    > User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    > Bootstrap Protocol
    >
    > Frame 4 (342 bytes on wire, 342 bytes captured)
    > Ethernet II, Src: 00:50:56:e9:3e:1d, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.56.254 (192.168.56.254), Dst Addr: 192.168.56.128 (192.168.56.128)
    > User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68)
    > Bootstrap Protocol
    >
    > Frame 5 (58 bytes on wire, 58 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1110 (1110), Dst Port: pop3 (110), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 6 (58 bytes on wire, 58 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: pop3 (110), Dst Port: 1110 (1110), Seq: 0, Ack: 1, Len: 0
    >
    > Frame 7 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1110 (1110), Dst Port: pop3 (110), Seq: 1, Ack: 1, Len: 0
    >
    > Frame 8 (74 bytes on wire, 74 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: 32785 (32785), Dst Port: auth (113), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 9 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: auth (113), Dst Port: 32785 (32785), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 10 (74 bytes on wire, 74 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: 32785 (32785), Dst Port: auth (113), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 11 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: auth (113), Dst Port: 32785 (32785), Seq: 1328219829, Ack: 1, Len: 0
    >
    > Frame 12 (74 bytes on wire, 74 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: 32785 (32785), Dst Port: auth (113), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 13 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: auth (113), Dst Port: 32785 (32785), Seq: 97199001, Ack: 1, Len: 0
    >
    > Frame 14 (74 bytes on wire, 74 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: 32785 (32785), Dst Port: auth (113), Seq: 0, Ack: 0, Len: 0
    >
    > Frame 15 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: auth (113), Dst Port: 32785 (32785), Seq: 342773985, Ack: 1, Len: 0
    >
    > Frame 16 (106 bytes on wire, 106 bytes captured)
    > Ethernet II, Src: 00:0c:29:0a:2a:f0, Dst: 00:50:56:e7:fa:2f
    > Internet Protocol, Src Addr: 192.168.56.128 (192.168.56.128), Dst Addr: 192.168.1.101 (192.168.1.101)
    > Transmission Control Protocol, Src Port: pop3 (110), Dst Port: 1110 (1110), Seq: 1, Ack: 1, Len: 52
    > Post Office Protocol
    >
    > Frame 17 (54 bytes on wire, 54 bytes captured)
    > Ethernet II, Src: 00:50:56:e7:fa:2f, Dst: 00:0c:29:0a:2a:f0
    > Internet Protocol, Src Addr: 192.168.1.101 (192.168.1.101), Dst Addr: 192.168.56.128 (192.168.56.128)
    > Transmission Control Protocol, Src Port: 1110 (1110), Dst Port: pop3 (110), Seq: 1, Ack: 53, Len: 0

    Time is spent in Frame6-15 , some kind of cycling as far as I understand
    ... Someone who can help or give me hints ?

    Thanks.

    Jos

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