ip_vs_tunnel_xmit ttl patch

["Guillaume Giroux" <gug@xxxxxxxxxxxx>]

Hi,

I just patched ip_vs.c in ip_vs_tunnel_xmit()


        iph->daddr              =       rt->rt_dst;
        iph->saddr              =       rt->rt_src;
-       iph->ttl                =       old_iph_ttl;
+       iph->ttl                =       old_iph->ttl<20 ? old_iph->ttl+16 :
old_iph->ttl;
        iph->tot_len            =       htons(skb->len);
        iph->id                 =       htons(ip_id_count++);


to increase the ttl of IPIP packets, because some of our real servers are
15-17 hops away from the director, and many users have a default ttl of
32 (thanks $MAJOR_OS_AND_SOFTWARE_COMPANY), so they were not able to reach
our RS if themselves were more than 16 hops from the director. I guess
this violates a couple of RFCs but it seems to work.


comments?

GG