DHCP reservations vs static addresses Networking |
- DHCP reservations vs static addresses
- Multicast Routing Troubleshooting
- Retro-networking Question: PRI over ethernet
- Outdoor poe 24&48vdc output switch?
- Is possible to apply VLAN segregation with layer2 switch?
- Linux Host as Packet Capture device
- Is there a way to configure 3 routers into a single GLBP virtual interface?
- Redundant Internet & UPS home worker equipment.
| DHCP reservations vs static addresses Posted: 29 Nov 2021 02:06 PM PST Are there are good reasons not to use DHCP reservations for hosts with fixed addresses? Like printers, camera systems, access control systems, etc. Are there are industry guidelines for this? Because a colleague was asking why many enterprises still use static addresses for non-network infra (things other than routers, switches, etc). [link] [comments] |
| Multicast Routing Troubleshooting Posted: 29 Nov 2021 10:53 AM PST I have a new application which requires multicast routing between a few subnets. This is my first time configuring Multicast routing in a production environment. We have elected to use PIM Sparse Mode and a static RP configuration. The L3 VLAN Interfaces all live on a Cisco 4500X VSL Stack. These interfaces are already routing Unicast traffic. I have configured IP multicast routing on the core switch using the ip multicast-routing command, and specified the static RP address using the ip pim rp-address x.x.x.x command. The RP address is a Loopback interface on the same core switch stack. I have configured PIM Sparse Mode using the ip pim sparse-mode command on each of the applicable VLAN interfaces and RP LO Interface. After configuration, I attempted to test multicast using a pair of devices running a multicast testing tool (One Server and One Client). The client PC is not receiving any multicast traffic, except when on the same subnet as the server. The multicast group address (239.0.1.2) is also not appearing in the output of show ip igmp groups on the L3 core switch . IGMP V2 is enabled on all of the associated L3 interfaces. All of the enabled interfaces do appear in the output of the show ip pim interface command. Did a bit of Wireshark inspection as well... I am seeing the IGMP group join messages coming from the client device, and the MC trafffic sourced from the server. It does not appear the MC stream is making it to the client subnet at all though. I have a feeling there may be something else required to make multicast work, that I have missed. Any ideas or troubleshooting next-steps would be appreciated. [link] [comments] |
| Retro-networking Question: PRI over ethernet Posted: 29 Nov 2021 10:17 AM PST (This a hypothetical/play/homelab/fun question and not for any production use, as I know PRI/T1 are fairly obsolete-ish, but it does involve enterprise networking, and may be of use to someone in real use cases.) Just curious if there is a piece of gear I can get that can adapt a PRI to IP without using SIP? An example use case would be two Legacy PBXs on the same property but in different physical locations. I know I can use a crossover cable, but let's say I needed to use wireless, like WIFI to connect the two. (Again, this is just for fun, not for real-life/daily use). I understand there's carrier-grade gear to do this currently as its how most PRIs are delivered anymore, but I'm not sure if there's something I would be able to use without some kind of concentrator/etc that would normally be on the CLEC side of things. Also curious if a standard old Cisco router would accomplish this as well (T1 I can see it working, but what about PRI?). I'm not a Cisco person but I know Cisco treats a T or PRI as serial channels. I think it was common back in the day to set up a Cisco lab to connect 2 T1 access routers together using a T1 crossover cable, but what about doing the opposite and connecting them via ethernet instead? I also don't want to use a sip channel bank or any sip converters - I'd like the PRI to be a "real" PRI with TDM data and timing, and not SIP. PBX --> PRI --> Ethernet (WIFI) --> PRI --> PBX I suppose I could use 2 Asterisk instances with PRI cards, but not sure that would keep the PRI pure, as it would have to use some interim channel protocol like SIP or ZAP, like this: PBX #1 <-- PRI --> PRI Card (Asterisk) <----> SIP/ZAP <----> Asterisk (PRI Card) <-- PRI--> PBX #2 [link] [comments] |
| Outdoor poe 24&48vdc output switch? Posted: 29 Nov 2021 03:13 PM PST Looking for an outdoor or at least temperature hardened switch, 4-8 ports, that can output 24 and 48vdc. Trying to run a ptp radio and a few cameras. Avoiding anything Unify. You guys run into anything like this? [link] [comments] |
| Is possible to apply VLAN segregation with layer2 switch? Posted: 29 Nov 2021 09:43 AM PST Hi all, on my project i have to implement Network segregation (logical or physical). The problem is that they only have FORTISWITCH 148E that it's a switch layer 2. So as far i know is not possible to use this switch for VLAN implementation and segregation because it's allows only the communication INTRA-VLAN and not INTER-VLAN (between 2 different VLANS) The only way is through a physical segragation, right? or there is some way to go on with logical? Also on on fortinet site they report for this switch: - VLANs Supported they means that it's support the INTRA-VLAN communication right? because its a little misleading. thanks in advance!! [link] [comments] |
| Linux Host as Packet Capture device Posted: 29 Nov 2021 04:46 PM PST I am using a Linux VM as a inline packet capture device. I have noticed when gathering the pCAPS the length of the frames are well beyond the physical link. I have disabled TCP Seg Offload/Large Segment Offload but still see frames reassembled and large in the pCAP. Anyone doing something similar and able to see the frame size as the link size, not the reassembled packet? [link] [comments] |
| Is there a way to configure 3 routers into a single GLBP virtual interface? Posted: 29 Nov 2021 10:34 AM PST So I have GLBP setup and it's working with 2 routers and I'm trying to connect a 3rd router for redundancy. The issue I think I'm running into is that in order to have a 3rd router in the same virtual interface the interface IP has to be within the subnet of the other 2 routers and the GLBP VIP subnet. Is it not possible to add a 3rd router into the mix? Is it uncessary? Would I have to use VRRP/HSRP to have a larger redundancy cluster? Yes I am trying to load balance as well. [link] [comments] |
| Redundant Internet & UPS home worker equipment. Posted: 29 Nov 2021 08:13 AM PST Hi all, I am looking for hardware / ecosystem recommendations for the following: Scenario About 10 home workers in different countries, not all have reliable power or internet connections. Device(s) Requirements:
Metrics & Alerting I am looking to centralize the alerts, monitoring, etc ideally into something like Grafana, or if the ecosystem can do this for us, that is also fine.
I have played around with pfsence and tunnels, with snmp, etc. I can make it work, however there is too much technical overhead required for management, lack of centralized management cloud and complexity for end user setup. Meraki and Ubquity seem like ok options, but I really don't know enough about what better solutions may be available, or within these specific brands what combinations would work best. I am also not looking at spending thousands per deploy. Thanks in advance. [link] [comments] |
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