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Wed Mar 17 00:39:23 2021 UTC (3 years, 7 months ago) by misho
Branches: mpd, MAIN
CVS tags: v5_9p16, v5_9, HEAD

mpd 5.9

1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> 2: <HTML> 3: <HEAD> 4: <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> 5: <TITLE>Troubleshooting</TITLE> 6: </HEAD> 7: <BODY text="#000000" bgcolor="#ffffff"> 8: 9: <A HREF="mpd.html">Mpd 5.9 User Manual</A> 10: : <A HREF="mpd62.html">Troubleshooting</A> 11: : Troubleshooting  12: Previous: <A HREF="mpd62.html">Troubleshooting</A>  13: Next: <A HREF="mpd64.html">Internals</A> 14: 15: 16: <HR NOSHADE> 17: <H2><A NAME="63"></A>7.1. Troubleshooting<A NAME="trouble"></A></H2> 18: Some tips for troubleshooting. 19: 20: For further help, ask to the <code>freebsd-net@freebsd.org</code> 21: mailing list or sourceforge.net mpd project forum. 22:  23: <dl> 24: 25: <dt>It does not work and I do not understand why.<dd>Mpd has extensive logging system supporting syslog. To direct logs 26: into a file add lines 27: <pre> 28: !mpd 29: *.* /var/log/mpd.log 30: </pre> 31: 32: into your /etc/syslog.conf file, create /var/log/mpd.log file and send 33: SIGHUP to syslogd to reread config. 34: To enable all possible logging you can use 'log +all' command. 35: 36: <dt>Packets won't flow.<dd>Make sure you have set <code>gateway_enable="YES"</code> 37: in <code>/etc/rc.conf</code>, otherwise your FreeBSD box will not 38: route packets. 39: Also, check your firewall settings. Mpd will create new interfaces 40: which may need to be incorporated into your firewall rules. 41: If you're doing PPTP, you need to allow TCP port 1723 and IP protocol 42: 47 (GRE). 43: 44: <dt>It does not work and there are strange netgraph-related errors in the log.<dd>Make sure you have all the required netgraph KLD's loaded. 45: You can check them by doing <code> kldstat -v | grep ng_ </code>. 46: Usually these are loaded on demand. If not, you can load them 47: manually using <code>kldload(8)</code>. 48: The following node types are or may be needed: 49:  50: <ul> 51: <li><code>ng_async</code></li> 52: <li><code>ng_bpf</code></li> 53: <li><code>ng_car</code></li> 54: <li><code>ng_deflate</code></li> 55: <li><code>ng_ether</code></li> 56: <li><code>ng_iface</code></li> 57: <li><code>ng_ksocket</code></li> 58: <li><code>ng_l2tp</code></li> 59: <li><code>ng_mppc</code></li> 60: <li><code>ng_ppp</code></li> 61: <li><code>ng_pppoe</code></li> 62: <li><code>ng_pptpgre</code></li> 63: <li><code>ng_nat</code></li> 64: <li><code>ng_netflow</code></li> 65: <li><code>ng_pred1</code></li> 66: <li><code>ng_socket</code></li> 67: <li><code>ng_tcpmss</code></li> 68: <li><code>ng_tee</code></li> 69: <li><code>ng_tty</code></li> 70: <li><code>ng_vjc</code></li> 71: </ul> 72:  73: 74: <dt>My configuration does not seem to be working as expected.<dd>Make sure your <code>mpd.conf</code> file formatted properly. 75: Labels must be left-justified, while other lines must not. 76: 77: <dt>I am getting no valid response from the RADIUS server.<dd>Double-check the shared secret in the RADIUS servers config and the 78: one specified in <code>mpd.conf</code> or <code>radius.conf</code>. 79: Check the ports of the RADIUS server: they should be 1812 (authentication) 80: and 1813 (accounting), wich are also the default ports of mpd. In 81: the past unofficial port numbers (1645 and 1646) were used for RADIUS, 82: but these are deprecated. 83: 84: <dt>I am getting ``Operation not permitted'' errors trying to run mpd.<dd>This is often caused by a combination of (a) using netgraph in KLD module 85: form instead of statically compiling the various modules into the kernel 86: via kernel <code>config(8)</code> options, and (b) increasing your 87: kernel security level (see the <code>init(8)</code> man page), which prevents 88: KLD modules from being loaded. Change one of these things to fix the problem. 89: 90: <dt>I have configured a link for dial-in and sometimes after disconnecting 91: mpd gets into some kind of infinite loop.<dd>This is because mpd is trying to ``redial'' which of course is not 92: appropriate for dial-in links. Use <code>set link max-redial -1</code> and 93: <code>set bundle yes noretry</code> to disable the redial function. 94: 95: <dt>I use mpd as PPTP server for Windows XP clients. While accessing bigger 96: websites or listing larger ftp directories the connection 97: seems to hang.<dd>Windows XP insists on a very low MTU (usually 1396 Bytes). This needs 98: fragmentation if bigger packets should be transmitted over the link. 99: Fragmentation is negotiated at ICMP level. If there is a bad router 100: somewhere in the network dropping such packets then the connection 101: hangs. 102: The first thing what you can try is reducing mpd's MTU value, by 103: setting: <code>set link mtu 1300</code> and <code>set bundle disable multilink</code>, 104: this should help in most cases. 105: For TCP connections it is possible enabling the TCP-MSS-Fix: 106: <code>set iface enable tcpmssfix</code>. 107: 108: <dt>Problems with MPPE stateless when connecting to Cisco devices.<dd>Upgrade the IOS of your device, see: 109: <code>CSCdu30944 MPPE rejects stateless Fixed in 12.3(11.4)</code> 110: 111: </dl> 112:  113: 114: <HR NOSHADE> 115: <A HREF="mpd.html">Mpd 5.9 User Manual</A> 116: : <A HREF="mpd62.html">Troubleshooting</A> 117: : Troubleshooting  118: Previous: <A HREF="mpd62.html">Troubleshooting</A>  119: Next: <A HREF="mpd64.html">Internals</A> 120: 121: 122: 123: </BODY> 124: </HTML>