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<TITLE>RE: [Babel-users] Convergence problem</TITLE>
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<P><FONT SIZE=2>I used ipv6cp-use-persistent in /etc/ppp/options files, and problem of changing link local address was solved. I can also try without ipv6cp-use-persistent, to test patch, if you there is a necessity.<BR>
<BR>
But problem with convergence is still present, not always but sometimes. I enclosed again debug files, I tried few times disconnecting link, after few successful converging of link, you can see there is still a problem. The only solution was to disconnect link from other side or to restart babel process. <BR>
<BR>
I did not change any of parameters.<BR>
<BR>
ANd again thank you very much for support. I hope you dont have to much work because of my experiments :)<BR>
<BR>
Robert<BR>
<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: Juliusz Chroboczek [<A HREF="mailto:Juliusz.Chroboczek@pps.jussieu.fr">mailto:Juliusz.Chroboczek@pps.jussieu.fr</A>]<BR>
Sent: Thu 7/3/2008 5:23 PM<BR>
To: Robert Lukan; babel-users@lists.alioth.debian.org<BR>
Subject: Re: [Babel-users] Convergence problem<BR>
<BR>
> The issue is that your implementation of ppp switches link-local<BR>
> addresses on every up/down event. IPv6 link-local addresses are<BR>
> supposed to remain stable, so this is why Babel gets confused by this<BR>
> case. I'll implement a workaround, but you really should try to<BR>
> ensure that your link-local addresses remain stable if possible.<BR>
<BR>
Please try the attached patch, and let me know if it fixes your issue.<BR>
<BR>
Juliusz<BR>
<BR>
Thu Jul 3 17:21:04 CEST 2008 Juliusz Chroboczek <jch@pps.jussieu.fr><BR>
* Protect against duplicate neighbours.<BR>
diff -rN -u old-babel/neighbour.c new-babel/neighbour.c<BR>
--- old-babel/neighbour.c 2008-07-03 17:21:33.000000000 +0200<BR>
+++ new-babel/neighbour.c 2008-07-03 17:21:33.000000000 +0200<BR>
@@ -48,6 +48,17 @@<BR>
return NULL;<BR>
}<BR>
<BR>
+struct neighbour *<BR>
+find_neighbour_by_id(const unsigned char *id, struct network *net)<BR>
+{<BR>
+ struct neighbour *neigh;<BR>
+ FOR_ALL_NEIGHBOURS(neigh) {<BR>
+ if(memcmp(id, neigh->id, 16) == 0 && neigh->network == net)<BR>
+ return neigh;<BR>
+ }<BR>
+ return NULL;<BR>
+}<BR>
+<BR>
void<BR>
flush_neighbour(struct neighbour *neigh)<BR>
{<BR>
@@ -84,6 +95,22 @@<BR>
neigh = NULL;<BR>
}<BR>
}<BR>
+<BR>
+ neigh = find_neighbour_by_id(id, net);<BR>
+ if(neigh) {<BR>
+ if((neigh->reach & 0xE000) == 0) {<BR>
+ /* The other neighbour is probably obsolete. */<BR>
+ flush_neighbour(neigh);<BR>
+ neigh = NULL;<BR>
+ } else {<BR>
+ fprintf(stderr, "Duplicate neighbour %s (%s and %s)!\n",<BR>
+ format_address(id),<BR>
+ format_address(neigh->address),<BR>
+ format_address(address));<BR>
+ return NULL;<BR>
+ }<BR>
+ }<BR>
+<BR>
debugf("Creating neighbour %s (%s).\n",<BR>
format_address(id), format_address(address));<BR>
<BR>
<BR>
<BR>
</FONT>
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