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Hey everyone. My employer has asked me to seek some training on VoIP, SIP, and MGCP, as I prepare to take on new roles and responsibilities. I'm not up to speed on VoIP, SIP, or MGCP, and figure I better get a good understanding before getting product specific. The products I'll be working...

Thanks for the replies. The Cisco 2621 routers are running Version 12.1(3r)T2, RELEASE SOFTWARE (fc1). I want to ensure I'm understanding this the correct way. The telephony systems will automatically prioritize the packets, and I would need to enable QoS on the core switches and the Cisco...

So what needs to be enabled on the Cisco 2600 routers in this particular scenario? How would I "carry out" QoS beyond the LAN side? I appreciate the feedback. Regards, Mark

Hi everyone. I have a question to about VoIP. I have two sites, one in Las Vegas and one in Columbus. Las Vegas has a Nortel Option 11c and Columbus has a Nortel MICS key system. I would like to add an ITG Line Side card to the Option 11c and a Norstar VoIP Gateway to the MICS. Currently there...

Hi there! I'm wondering if anyone is aware of any training DVDs, CDs, that cover intermediate to advanced topics of Network Security, or even networking in general? I find that I learn better when watching an instructional video and apply that to my real world experience rather than reading a...

I nailed it. Thanks to everyone for their help. Without the collective input I would not have resolved the issue. Thanks to the Sniffer ART, it helped escalate the issue to the AS400 and Stratus administrators and we found the applications that were causing high CPU and DISK usage and...

I'm sorry, packets seen was approximately 150,000. Sr. Network Engineer ArcLight Systems, LLC http://www.markholloway.com

I'm not sure why there are so many Rejected packets, unless these are ones that don't match my Sniffer Filter for this capture....? I am mirroring a port (AS400) and the Stratus is only one of many devices sending data. I created a filter in Sniffer so only those two devices capture packets...

I'm still doing a capture between my AS400 and Stratus and in the Capture Panel (Detail View) I'm seeing (roughly): #seen 15,000 #dropped 0 #accepted 85,000 #rejected 64,000 I have the AS400 and Stratus both plugged into my Foundry switch. I am mirroring the Stratus port and have a filter...

I am performing a capture and I do not see a three way handshake. I do know the data is a continuous stream coming from one of our partners over the WAN. They are sending us data 24/7. The pattern I am seeing so far is when the AS400 is put under heavy load with other functions, this problem...

I am replacing some old Bay ARN routers with Cisco and will be adding an additional WAN circuit to provide redundancy. Here is the scenario: I want to provide redundancy from one WAN site to another. Location 1 will have a 2620 router with two WIC1-DSU cards and Location 2 will have a 2620...

I know the AS400 has a default MTU size of 1460. I looked at the interface parameters. I have not checked the Stratus as I have to have my Stratus Admin do it. Should the MSS be the same as MTU? I am having a hard time tracking down the MSS. I'm skimming through the packets right now...

I'm still having a problem with transferring data between as AS400 and a Stratus VOS, both on 100TX full duplex connected via a Foundry Network Big Iron 4000. I have now captured packets using Microsoft Netmon to compare to my Sniffer capture. One thing I noticed is that the AS400 always has a...

I think Sniffer is giving me a false expert flag, but what do you guys think? I have a desktop host with the IP address 10.11.100.50/23 and a server on 10.11.2.5/23. Two different IP networks, of course, but both devices are plugged into a Foundry Big Iron and 10.11.100.50 is VLAN 100, and...

I'm seeing the same sequence number about eight times for a single packet. Ugh! Both servers are 100TX, for duplex, connected to a Foundry Big Iron 4000 on the same ethernet blade, and the ports are set for 100 FULL. There are no CRC errors on the switch ports. Sr. Network Engineer...

I have tried alternate switch ports and get the same results. I have not adjusted the thresholds yet. I thought that Sniffer knew whether the packet was a re-transmit or not. I've looked at the utilization of the interface on the AS400 using SNMP, and utilization is 1Mbit. Sr. Network...

Thanks. Sprint did not tell me that the MICB is accessed through the web browser. The manual refers to it as if it's a seperate application. I now have the IP address and username/password to access the MICB. :) Sr. Network Engineer ArcLight Systems, LLC http://www.markholloway.com

I am monitoring traffic to/from our AS400 server and there is a huge amount of TCP retransmits. The AS400 is plugged into a Foundry switch and I've hard-fixed the port for 100-full and the NIC is 100-full. I've even tried them at 100-half, but the same results occur. The majority of traffic to...

Sprint installed an Option 11c at my work and I am responsible for the phone system. I am using Optivity to manage the system and Call Pilot via the web browser for voice mail. We purchased a MICB for conference bridges, but Sprint did not load any BUI software. The book refers to the BUI...

You are correct. I emailed Xyratex and the told me they have a contract with NAI to make them for NAI only and they cannot be purchased anywhere but through NAI. Sr. Network Engineer ArcLight Systems, LLC http://www.markholloway.com