Ron Wellsted
2005-Apr-19 13:16 UTC
[Asterisk-Users] Asterisk Netgear FSM7326P and Cisco 7960 on VLAN
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I have just finished a couple of very frustrating days trying to resolve an issue with Asterisk 1.0.5, Netgear FSM7326P and Cisco 7960 phones under SIP using a VLAN for the VoIP traffic. The switch was configured with a default VLAN of 1 and the 7960s were configured for a VLAN of 2. The 7960s were tested with SIP firmware 7.3 and 7.4 The symptoms were as follows: 1/ When the phones were idle, every few minutes, the asterisk server would loose MAC/IP address mapping for a phone. Approx 10 seconds later the mapping would reappear. (checked with "arp -avn") 2/ When in a call, we would randomly loose sound TO the phone. Sound FROM the phone was OK. This loss would continue for about 10 seconds. Using ethereal, we sniffed the traffic in and out of the Asterisk box and saw that we were not getting replies to the targeted ARP packets being sent from the asterisk box, only replies to the broadcast ARP packets. Sniffing a phone revealed that although the ARP packets were correctly tagged as VLAN 2, the phone was replying to the targeted ARP packets on VLAN 1 (!?). As a result the Asterisk box was (correctly) expiring the arp cache entry when the ttl was reached, then it would send a broadcast ARP packet which would be responded to by the phone on VLAN 2. I have worked around this be removing the VLANs and by using DHCP reservations to put the phones on a different subnet from the rest of the network. Has anyone else found themselves in a similar situation? If so, how did you work around it? Is it worth raising a TAC with Cisco? - -- Ron Wellsted http://www.wellsted.org.uk ron@wellsted.org.uk FWD:519961 Gossiptel:9309811 N 52.567623, W 2.137621 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iQEVAwUBQmVnB0tP/KMNOfRbAQKgQAf8CI09aPcapNvYD50WiR9s9I2bdGYgzUfI nUqluX1389gLPk4XVuziSKoIMpunJQa2/uaES6NzJkYJk7bYS3MkDh2J6CZK2niZ 2BKBIxwwwkPGhJFYTJE0P/848qLQF6qemM+zJHR/GJr10UpAEKd9ElSyoywHe3NS pVAX8hztsqSM9dpk5cu1+bLLruxSBWVbWgF4GkyjPGXz6U47Ee+x/fDIvi5GGuXf QHrMzAokFycE8omtcx7CR1E2KbSb0H+P3SKroegH7V4PS/3Z45mDcP+owBDMNSSm rcfwNmMPjbwCXxySPu6x07kQo2UfK3ws6e4iZbZGspMFO7AsLq0Q9Q==JmsL -----END PGP SIGNATURE-----
SCollins
2005-Apr-19 16:06 UTC
[Asterisk-Users] Asterisk Netgear FSM7326P and Cisco 7960 on VLAN
I had and issue with the FSM732P and DHCP Requests. I would get intermitant connectivity and eventually I would loose connectivity on a port, move the IP phone to a new port and eventually loose connectivity. The Netgear sounds suspect. If all ports are a member of Default VLAN 1, untagged, and the ports are set to Admit All, the Switch will assign all packets received (untagged and those with priotization set) to PVID 1. Could it be a VLAN configuration or Routing problem? Maybe it's a known bug that has been resolved with Firmware? " FSM7326P Software Version 3.0.3.2 Issues This Firmware Resolves 1. The VLAN priority setting as configured were not working. 2. When setting fixed speed at 1000Mbps full-duplex for copper ports, the switch issued a warning. 3. The switch only allowed 8 route entries instead of 16 route entries" Hope something I said helps. Sean On Tue, 19 Apr 2005 21:16:07 +0100, Ron Wellsted <ron@wellsted.org.uk> wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, > > I have just finished a couple of very frustrating days trying to resolve > an issue with Asterisk 1.0.5, Netgear FSM7326P and Cisco 7960 phones > under SIP using a VLAN for the VoIP traffic. > > The switch was configured with a default VLAN of 1 and the 7960s were > configured for a VLAN of 2. The 7960s were tested with SIP firmware 7.3 > and 7.4 > > The symptoms were as follows: > 1/ When the phones were idle, every few minutes, the asterisk server > would loose MAC/IP address mapping for a phone. Approx 10 seconds later > the mapping would reappear. (checked with "arp -avn") > > 2/ When in a call, we would randomly loose sound TO the phone. Sound > FROM the phone was OK. This loss would continue for about 10 seconds. > > Using ethereal, we sniffed the traffic in and out of the Asterisk box > and saw that we were not getting replies to the targeted ARP packets > being sent from the asterisk box, only replies to the broadcast ARP > packets. > > Sniffing a phone revealed that although the ARP packets were correctly > tagged as VLAN 2, the phone was replying to the targeted ARP packets on > VLAN 1 (!?). As a result the Asterisk box was (correctly) expiring the > arp cache entry when the ttl was reached, then it would send a broadcast > ARP packet which would be responded to by the phone on VLAN 2. > > I have worked around this be removing the VLANs and by using DHCP > reservations to put the phones on a different subnet from the rest of > the network. > > Has anyone else found themselves in a similar situation? If so, how did > you work around it? > > Is it worth raising a TAC with Cisco? > > - -- > Ron Wellsted > http://www.wellsted.org.uk > ron@wellsted.org.uk > FWD:519961 Gossiptel:9309811 > N 52.567623, W 2.137621 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.1 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org > > iQEVAwUBQmVnB0tP/KMNOfRbAQKgQAf8CI09aPcapNvYD50WiR9s9I2bdGYgzUfI > nUqluX1389gLPk4XVuziSKoIMpunJQa2/uaES6NzJkYJk7bYS3MkDh2J6CZK2niZ > 2BKBIxwwwkPGhJFYTJE0P/848qLQF6qemM+zJHR/GJr10UpAEKd9ElSyoywHe3NS > pVAX8hztsqSM9dpk5cu1+bLLruxSBWVbWgF4GkyjPGXz6U47Ee+x/fDIvi5GGuXf > QHrMzAokFycE8omtcx7CR1E2KbSb0H+P3SKroegH7V4PS/3Z45mDcP+owBDMNSSm > rcfwNmMPjbwCXxySPu6x07kQo2UfK3ws6e4iZbZGspMFO7AsLq0Q9Q=> =JmsL > -----END PGP SIGNATURE----- > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >-- http://www.1and1.com/?k_id=8358073