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Re: telnet in redboot


I have already accessed target on serial port.

below is tcpdump message:

tcpdump -v
tcpdump: listening on eth0
11:22:36.376854 arp who-has 192.168.1.14 tell 192.168.1.10
11:22:36.383097 arp reply 192.168.1.14 is-at 91:5:c6:1:56:40
11:22:36.383134 192.168.1.10.32771 > 192.168.1.14.9000: S [tcp sum ok] 1178106054:1178106054(0) win 5840 <mss 1460,sackOK,timestamp 1683156 0,nop,wscale 0> (DF) [tos 0x10] (ttl 64, id 54802, len 60)
11:22:36.385255 192.168.1.14.9000 > 192.168.1.10.32771: S [tcp sum ok] 0:0(0) ack 1178106055 win 1472 <mss 1472> (ttl 64, id 1, len 44)
11:22:36.385333 192.168.1.10.32771 > 192.168.1.14.9000: . [tcp sum ok] ack 1 win 5840 (DF) [tos 0x10] (ttl 64, id 54803, len 40)
11:22:36.388774 192.168.1.14.9000 > 192.168.1.10.32771: P [bad tcp cksum 20!] 1:10(9) ack 1 win 1472 (ttl 64, id 2, len 49)
11:22:37.425774 192.168.1.14.9000 > 192.168.1.10.32771: P [bad tcp cksum 20!] 1:10(9) ack 1 win 1472 (ttl 64, id 3, len 49)
11:22:38.462727 192.168.1.14.9000 > 192.168.1.10.32771: P [bad tcp cksum 20!] 1:10(9) ack 1 win 1472 (ttl 64, id 4, len 49)
....

20 packets received by filter
0 packets dropped by kernel

what does 'bad tcp cksum 20!' mean?

thanks!

jjcho


From: Jonathan Larmour <jifl@eCosCentric.com>
To: Cho JinJe <winjjcho@hotmail.com>
CC: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] telnet in redboot
Date: Thu, 23 Jan 2003 22:14:34 +0000

Cho JinJe wrote:
> Hi, all
>
> I have a question about telnet in redboot.
> I have ported redboot to SH7709s custom board which has cs8900a
ethernet
> interface.
>
> Ping is ok(both of host and target).
> but when I open telnet connection, I can't see 'redboot>' prompt in
shell.
>
> [root@localhost root]# telnet 192.168.1.14 9000
> Trying 192.168.1.14...
> Connected to 192.168.1.14.
> Escape character is '^]'.
>                               <- there is no prompt.

Have you already accessed it on another port like a serial port? This
shouldn't make a difference as I believe telnet should work regardless,
but it might.

Other than that, I suggest running an ethernet sniffer like tcpdump on
your host to see if the target is sending _anything_. I take it you've
confirmed that it thinks it's working, with good MAC address and IP.

Jifl
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