Hi,
Originally
I have to access a remote Tru64 system through a firewall which has a
session idle timeout of 1hr. 'Til now I went via a VMS system which kept the
sessions open. I've just lost my access to that system so now I have to go
direct from the Alphastation on my desk. I can't get the firwall changed so
is there some option I can set on the Tru64 telnet session such that the
links don't get dropped? For example, if I run a vdump session on the remote
box, even though it generates output on my local screen, unless I kit the
shift key or something the session gets dumped after an hour. Anyone know
what the difference is between how VMS and unix handles the telnet session?
I'm curious to know why the VMS sessions aren't regarded as being idle by
the firewall despite there being no input from either end whereas the unix
sessions demand keyboard input from the system inside the firewall to keep
them active.
Well, I found out what's happening to keep the sessions alive but I don't
know why it's happening. This from an IP trace between a unix box and a
remote VMS system:
VMS sends a packet out once per minute and the reply is sufficient to keep
the link through the firewall up. Don't know why VMS does what it does but
there it is.
Cheers
Joe
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 8 arrived at 13:38:24.90
ETHER: Packet size = 60 bytes
ETHER: Destination = 8:0:20:d1:d8:38, Sun
ETHER: Source = 0:2:fd:7e:e1:c1,
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 41 bytes
IP: Identification = 62548
IP: Flags = 0x0
IP: .0.. .... = may fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 115 seconds/hops
IP: Protocol = 6 (TCP)
IP: Header checksum = f304
IP: Source address = 128.x.x.x, andrsn
IP: Destination address = 172.x.x.x, btsunho01
IP: No options
IP:
TCP: ----- TCP Header -----
TCP:
TCP: Source port = 23
TCP: Destination port = 32890
TCP: Sequence number = 798530386
TCP: Acknowledgement number = 265537063
TCP: Data offset = 20 bytes
TCP: Flags = 0x10
TCP: ..0. .... = No urgent pointer
TCP: ...1 .... = Acknowledgement
TCP: .... 0... = No push
TCP: .... .0.. = No reset
TCP: .... ..0. = No Syn
TCP: .... ...0 = No Fin
TCP: Window = 3000
TCP: Checksum = 0xf82e
TCP: Urgent pointer = 0
TCP: No options
TCP:
TELNET: ----- TELNET: -----
TELNET:
TELNET: "*"
TELNET:
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 9 arrived at 13:38:24.90
ETHER: Packet size = 54 bytes
ETHER: Destination = 0:2:fd:7e:e1:c1,
ETHER: Source = 8:0:20:d1:d8:38, Sun
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 40 bytes
IP: Identification = 25921
IP: Flags = 0x4
IP: .1.. .... = do not fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 64 seconds/hops
IP: Protocol = 6 (TCP)
IP: Header checksum = 7519
IP: Source address = 172.x.x.x, btsunho01
IP: Destination address = 128.x.x.x, andrsn
IP: No options
IP:
TCP: ----- TCP Header -----
TCP:
TCP: Source port = 32890
TCP: Destination port = 23 (TELNET)
TCP: Sequence number = 265537064
TCP: Acknowledgement number = 798530387
TCP: Data offset = 20 bytes
TCP: Flags = 0x10
TCP: ..0. .... = No urgent pointer
TCP: ...1 .... = Acknowledgement
TCP: .... 0... = No push
TCP: .... .0.. = No reset
TCP: .... ..0. = No Syn
TCP: .... ...0 = No Fin
TCP: Window = 25192
TCP: Checksum = 0xcb7d
TCP: Urgent pointer = 0
TCP: No options
TCP:
TELNET: ----- TELNET: -----
TELNET:
TELNET: ""
TELNET:
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Received on Fri Nov 16 2001 - 14:52:28 NZDT