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(-)tcp_subr.c (working copy) (-5 / +3 lines)
Lines 1339-1349 Link Here
1339 
                                            if (!mtu)
 1325 
                                            if (!mtu)
1340 
                                                mtu = ip_next_mtu(ip->ip_len,
 1326 
                                                mtu = ip_next_mtu(ip->ip_len,
1341 
                                                 1);
 1327 
                                                 1);
1342 
                                           if (mtu < max(296, V_tcp_minmss
 1328 
                                           if (mtu < V_tcp_minmss
1343 
                                                + sizeof(struct tcpiphdr)))
 1329 
                                                + sizeof(struct tcpiphdr))
1344 
                                               mtu = 0;
 1330 
                                               mtu = V_tcp_minmss
1345 
                                           if (!mtu)
1346 
                                               mtu = V_tcp_mssdflt
1347 
                                                 + sizeof(struct tcpiphdr);
 1331 
                                                 + sizeof(struct tcpiphdr);
1348 
                                            /*
 1332 
                                            /*
1349 
                                             * Only cache the the MTU if it
 1333 
                                             * Only cache the the MTU if it
(-)tcp_output.c (working copy) (-1 / +3 lines)
Lines 1183-1190 Link Here
1183 
         * This might not be the best thing to do according to RFC3390
 1221 
         * This might not be the best thing to do according to RFC3390
1184 
         * Section 2. However the tcp hostcache migitates the problem
 1222 
         * Section 2. However the tcp hostcache migitates the problem
1185 
         * so it affects only the first tcp connection with a host.
 1223 
         * so it affects only the first tcp connection with a host.
1224 
        *
1225 
        * NB: Don't set DF on small MTU/MSS to have a safe fallback.
1186 
         */
 1226 
         */
1187 
       if (V_path_mtu_discovery)
 1227 
       if (V_path_mtu_discovery && tp->t_maxopd > V_tcp_minmss)
1188 
                ip->ip_off |= IP_DF;
 1228 
                ip->ip_off |= IP_DF;
1189 
        error = ip_output(m, tp->t_inpcb->inp_options, NULL,
 1229 
        error = ip_output(m, tp->t_inpcb->inp_options, NULL,

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