Bug 8046 - tftp server refuses connections under high loads
Summary: tftp server refuses connections under high loads
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: tftp
Version: 6.1
Hardware: All
OS: Linux
medium
high
Target Milestone: ---
Assignee: Bill Nottingham
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 1999-12-29 14:37 UTC by Joseph W. Breu
Modified: 2014-03-17 02:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2000-01-04 14:31:14 UTC


Attachments (Terms of Use)

Description Joseph W. Breu 1999-12-29 14:37:59 UTC
Under high TFTP loads (approx 5-10 requests per second), the TFTP server
starts to deny requests.

/var/log/messages
-----------------
Dec 29 05:51:31 breu tftpd[2168]: tftpd: trying to get file:
zenith-clone-generic-1.cfg
Dec 29 05:51:31 breu tftpd[2168]: tftpd: serving file from /tftpboot
Dec 29 05:51:33 breu tftpd[2170]: tftpd: trying to get file:
zenith-clone-generic-1.cfg
Dec 29 05:51:33 breu tftpd[2170]: tftpd: serving file from /tftpboot
Dec 29 05:51:33 breu tftpd[2170]: tftpd: read: Connection refused


/etc/inetd.conf
---------------
tftp	dgram	udp	wait.40000	root	/usr/sbin/in.tftpd	in.tftpd

Comment 1 Jeff Johnson 2000-01-04 14:31:59 UTC
What tftp version ("rpm -q tftp")?

If tftp-0.16, there is an attempt within the tftpd daemon to prevent DOS
attacks by delaying 0.1 secs between attempts to service a request. This
can be disabled if you desire in the source and recompiling. I'm hard pressed
to imagine a circumstance in which >10 tftp requests/second is generally
useful (read: I don't think that this should be disabled in the distributed
tftp package.)


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