diff options
| author | Brian Somers <brian@FreeBSD.org> | 1997-10-04 00:19:58 +0000 |
|---|---|---|
| committer | Brian Somers <brian@FreeBSD.org> | 1997-10-04 00:19:58 +0000 |
| commit | 816cbe8c7c77a01009f685d1c6d1e1dc9fd0bf7b (patch) | |
| tree | e6a5cca01232f0bb825b9c5d6e07eb2011043d99 /FAQ/FAQ.sgml | |
| parent | bea9d4e38c5eebb1471e71a81f91acd6d6487bb4 (diff) | |
Mention a pre-2.2.5 bug in the tun driver that gets tickled
by the "set mtu" command (now that we can see the IO error
in the log file).
Notes
svn path=/head/; revision=2028
Diffstat (limited to 'FAQ/FAQ.sgml')
| -rw-r--r-- | FAQ/FAQ.sgml | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/FAQ/FAQ.sgml b/FAQ/FAQ.sgml index a00e5e21aa..1bbecc5689 100644 --- a/FAQ/FAQ.sgml +++ b/FAQ/FAQ.sgml @@ -1,12 +1,12 @@ <!DOCTYPE linuxdoc PUBLIC "-//FreeBSD//DTD linuxdoc//EN"> -<!-- $Id: FAQ.sgml,v 1.79 1997-10-03 20:53:27 wosch Exp $ --> +<!-- $Id: FAQ.sgml,v 1.80 1997-10-04 00:19:58 brian Exp $ --> <article> <title>Frequently Asked Questions for FreeBSD 2.X <author>Maintainer: Peter da Silva <tt><htmlurl url='mailto:peter@taronga.com' name='<peter@taronga.com>'></tt> -<date>$Date: 1997-10-03 20:53:27 $</date> +<date>$Date: 1997-10-04 00:19:58 $</date> <abstract> This is the FAQ for FreeBSD systems version 2.X All entries are @@ -3549,6 +3549,27 @@ MYADDR: </verb> <sect2> + <heading>Ppp locks up during file transfers with IO errors</heading> + + <p> + Under FreeBSD 2.2.2 and before, there was a bug in the tun + driver that prevents incoming packets of a size larger than + the tun interface's MTU size. Receipt of a packet greater than + the MTU size results in an IO error being logged via syslogd. + + <p> + The ppp specification says that an MRU of 1500 should + <bf>always</bf> be accepted as a minimum, despite any LCP + negotiations, therefore it is possible that should you decrease + the MTU to less than 1500, your ISP will transmit packets of + 1500 regardless, and you will tickle this non-feature - locking + up your link. + + <p> + The problem can be circumvented by never setting an MTU of + less than 1500 under FreeBSD 2.2.2 or before. + + <sect2> <heading>None of this helps - I'm desperate !</heading> <p> |