Brian,
It's probably not necessary to resort to a tcpdump to solve a tftp
problem.
There's several things you can look for first.
1) is iptables blocking access to tftp?
iptables -L
If it shows anything other than 3 'ACCEPT' rules then it is probably
blocking access. You'll want to turn it off, and try again.
2) How are your interfaces setup on your server?
Do you have more than 1 NIC, and if you do, did you assign proper
addresses to both ?
When I say proper, I mean, are the addresses on 2 different networks?
3) What IP address is the client getting?
Is it unique on the network?
4) Is tftpd even listening?
netstat -anp | grep ":69 "
will tell you that.
5) Anything in the log files? /var/log/messages, /var/log/daemon.log
If the above questions don't lead you to the solution, then
send us the following info:
1) output of 'ipconfig -a'
2) your dhcpd.conf file
3) What distro are you running on the server
Also, you could try popping into the #ltsp irc channel for help.
There's several of us who hang out there all the time, and we can offer
interactive help.
Jim McQuillan
[EMAIL PROTECTED]
On Fri, 25 Mar 2005, Brian Caine wrote:
>
> To preface this let me say that I am extremely new to linux. I have
> aspirations of setting up a LTSP lab in my classroom, but first need to
> demonstrate to the powers that be that it would be functional and beneficial.
>
> To test a setup, I had to work with a pieced together server of the best
> components I had laying around, in an attempt to boot a single terminal.
> (specs: 600Mhz celeron processor 256MB ram 80Gig HD)
>
> I am able to assign the IP to the client. However the tftp process is very
> slow (this appears to be the slowest process on actually capable servers, so
> I expected that. I was quite doubtful that the server was up to the job, but
> am hoping for confirmation from someone more experienced. The dots appear
> quite slowly when attempting to load the vmlinuz file, and I have placed the
> results of a tcpdump below. BTW the longest I have allowed is about 3hours
> for the file to loads. :)
>
> Sorry for the long file and thanks for any input ahead of time.
> Brian
>
> [EMAIL PROTECTED]:~$ sudo tcpdump -v
> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> 13:03:25.359207 IP (tos 0x0, ttl 60, id 0, offset 0, flags [none], length:
> 576) 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from
> 00:08:a1:7c:4f:06, length: 548, xid:0xa18665cf, flags: [none]
> Client Ethernet Address: 00:08:a1:7c:4f:06 [|bootp]
> 13:03:25.400357 IP (tos 0x10, ttl 64, id 0, offset 0, flags [none], length:
> 328) 192.168.0.254.bootps > ws001.ltsp.bootpc: BOOTP/DHCP, Reply, length:
> 300, xid:0xa18665cf, flags: [none]
> Your IP: ws001.ltsp
> Server IP: 192.168.0.254
> Client Ethernet Address: 00:08:a1:7c:4f:06 [|bootp]
> 13:03:25.400821 IP (tos 0x0, ttl 60, id 0, offset 0, flags [none], length:
> 576) ws001.ltsp.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from
> 00:08:a1:7c:4f:06, length: 548, xid:0xa18665cf, flags: [none]
> Client Ethernet Address: 00:08:a1:7c:4f:06 [|bootp]
> 13:03:25.401652 IP (tos 0x10, ttl 64, id 0, offset 0, flags [none], length:
> 333) 192.168.0.254.bootps > ws001.ltsp.bootpc: BOOTP/DHCP, Reply, length:
> 305, xid:0xa18665cf, flags: [none]
> Your IP: ws001.ltsp
> Server IP: 192.168.0.254
> Client Ethernet Address: 00:08:a1:7c:4f:06 [|bootp]
>
>
> Cleint Mapping of ip to hw addr - comment by bcaine
> 13:03:25.403440 arp who-has 192.168.0.254 tell ws001.ltsp
> 13:03:25.403612 arp reply 192.168.0.254 is-at 00:08:a1:7c:50:e7
>
> Here is where the tftp starts, and each of these entries corresponds to one
> dot filling the screen. There were more entries of the same (one per dot)
> when tcpdump -vv was run.
>
> 13:03:25.403706 IP (tos 0x0, ttl 60, id 0, offset 0, flags [none], length:
> 76) ws001.ltsp.2001 > 192.168.0.254.tftp: [udp sum ok] 48 RRQ
> "/lts/vmlinuz-2.4.26-ltsp-2" octet blksize 1432
> 13:03:35.952881 IP (tos 0x0, ttl 60, id 0, offset 0, flags [none], length:
> 76) ws001.ltsp.2002 > 192.168.0.254.tftp: [udp sum ok] 48 RRQ
> "/lts/vmlinuz-2.4.26-ltsp-2" octet blksize 1432
> 13:03:56.492997 IP (tos 0x0, ttl 60, id 0, offset 0, flags [none], length:
> 76) ws001.ltsp.2003 > 192.168.0.254.tftp: [udp sum ok] 48 RRQ
> "/lts/vmlinuz-2.4.26-ltsp-2" octet blksize 1432
>
> 9 packets captured
> 9 packets received by filter
> 0 packets dropped by kernel
>
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