From: ElleJf\(Yahoo\) (ellejf@xxxxxxxxx)
Date: Thu Aug 09 2001 - 11:47:28 GMT-3
Hi group,
In RFC2166 DLSw v2 Enhancements, IP Multicast and UDP Unicast are supported. T
hese are used for send explorer and response packet, respectively. In Cisco Co
nfiguration Guide, you can always see introduction of these feature. I doubt
how can this be supported. UDP Unicast response may have no problem. But for
explorer to use IP Multicast, you need some multicast group address as destinat
ion and enable multicast routing as well in order to get the explorer forwarded
. But neither document or CCO have mention about multicast address and multica
st routing requirement for DLSw+. Do any one use these feature? Without crea
ting peer connection and still got the explorer packets sent? Is TCP connectio
n still required? Or that can be omitted? If we have conservative ACL and nee
d to explicitly permit thest IP Multicast/UDP Unicast packet, how address/port
we should filter?
The only link have such info is :
http://www.cisco.com/warp/customer/697/dlsw_udp.html
This link says :
"In contrast, DLSw+ sends UDP/IP multicast and unicast before the TCP connectio
n exists. DLSw+ uses IP multicast service when address resolution packets (CANU
REACH_EX, NETBIOS_NQ_ex, NETBIOS_ANQ, and DATAFRAME) are sent to multiple desti
nations. The response frames (ICANREACH_ex and NAME_RECOGNIZED_ex) are sent usi
ng UDP Unicast."
It seems that the feature are supported. If so, after TCP connection created,
the feature still used? Or change all packets to be transmited by TCP?
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