Questions tagged [pppoe]

For questions about PPPoE (Point-to-Point Protocol over Ethernet), which provides a method to connect two PPP nodes by encapsulating PPP frames inside Ethernet frames.

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37
votes
3answers
109k views

What is the difference between MSS and MTU?

I'm confused as to the difference between maximum segment size and a maximum transmission unit. Can someone please explain in relation to layers 2 and 3? If I had a packet of 800 bytes in the ...
16
votes
4answers
9k views

Why use PPPoE and not use IP directly?

As far as I understand, PPPoE operates over ethernet, so for PPPoE to be usable you should already be able to send Ethernet frames to your ISP. At that point, why use PPPoE at all? Why not just run ...
9
votes
1answer
2k views

Strange drop-outs in Cisco 7200 LNS lab

I'm testing several functions on emulated Cisco 7200 routers, in GNS3, prior to actual purchase. One of the functions I've been testing out is LNS functionality. I've been primarily following this ...
8
votes
1answer
645 views

Is ADSL's UDP packet forwarding rate strictly linear to packet size?

Suppose an ADSL2 Annex A device had a upload speed of 300kbps; tested using a TCP connection. Now suppose I want to send 8-byte UDP keep-alive packets at the maximum possible rate*. Would the ...
8
votes
1answer
820 views

Cisco IPv6 BNG Radius Attributes

I am trying to push out IPv6 unnumbered to an interface via radius. I am trying to do it in a similar fashion to how you would for IPv4: Cisco-AVPair += "ip:vrf-id=vrf-name", Cisco-AVPair += "ip:ip-...
7
votes
3answers
3k views

Broken PPPoE Config

We have been struggling with this for a few weeks now. CISCO 3825 (15.1 IOS) with properly established PPPoE (ie can ping the net from inside the cli). The problem we are having is that the client's ...
7
votes
1answer
4k views

PPPoE vs L2TP protocols

I am trying to find differences between PPPoE and L2TP.Both are tunneling protocols. When to use what? thanks, GL
7
votes
1answer
11k views

Cisco PBR verify-availability with interface instead of next-hop

We have a number of Cisco 891 routers configured with dual WAN links. All of these routers are running Cisco IOS 15.x In some cases, we use policy based routing to force particular traffic down one ...
6
votes
2answers
30k views

What exactly is IPoE?

I am familiar with PPPoE but getting confused with the term IPoE. Is this same as usual ethernet with DHCP server? Does this have any auth built-in? How do I get authenticated? What can a client ...
6
votes
2answers
2k views

PPPoE with NAT configuration broken

We are trying to replace our existing router with a newly purchased Cisco router: GigabitEthernet0/0: PPPoE GigabitEthernet0/1: 192.168.2.1 The PPPoE is getting established perfectly, and I can ping ...
6
votes
1answer
931 views

7609 + SIP-400 PPPoE: cannot route to the Internet

I am trying to configure a 7609 router with a SUP7203BXL, SIP-400 and SPA5xGE as BRAS. The configuration is at the bottom of the question. The sessions are created, but the clients can't reach ...
5
votes
1answer
201 views

Is it possible to set up a DSL lab environment?

I'm trying to figure out if I can setup a DSL lab for training purposes. If I have a switch or laptop running a PPPOE server, could I go from ethernet-to-modem then connect the modem's WAN port to ...
5
votes
1answer
3k views

Cisco 6509 as PPPoE BRAS

I have read that SIP-400 and SPA are compatible with 6509 series switch. These SIP and SPA are used to terminate PPP sessions on 7600 routers. If I installed this SIP and SPA (SPA-5X1GE-V2 for example)...
5
votes
1answer
439 views

Force fraffic between PPPoE users to pass through traffic management device

I would like that traffic between pppoe users passes through a traffic management device as showed below I have evarything working, i mean, users have ppp session and they have internet access via a ...
5
votes
1answer
247 views

Juniper ERX 310 traffic not going more than 710 mbps?

We have a Juniper ERX 310 configured as B-ras, as per specifications of the router, we should be able to terminate 8000 PPP sessions, but we notice that traffic on the router interface not going more ...
4
votes
2answers
11k views

Why PPTP, L2TP, PPPOE are in OSI Layer2?

PPTP, L2TP, PPPOE - these are tunneling protocols. And they are Data link Layer protocols. Why? As I understood, Layer2 protocols work only in same subnet. They don't use IP addresses and cannot be ...
4
votes
3answers
7k views

PPPoE - How does it reach the Radius Server?

Hi guys I have a couple of questions related to PPPoE. When an ISP provides a service and they use a Radius Server for Authentication how does the client router know where to send the Authentication ...
4
votes
1answer
2k views

PPPoE interface doesn't use ARP

LAN border routers often use PPPoE protocol to communicate with ISPs and to access the Internet through ADSL. This link provides an example of output of ifconfig about an interface using PPPoE (page ...
4
votes
1answer
1k views

Will an ERICSSON T720G GPON ONU & a Linux box work as an upstream PPPoE BRAS in our demo setup?

I am a volunteer teacher trying to get my students fired up by learning Broadband. Accordingly I am building a small scale DSL/PPPoE Broadband network that they can touch, deconstruct and put back ...
4
votes
1answer
317 views

Dot1q tags, sub-interfaces

Please consider dot1q frames tagged 100 circulating on a LAN (VLAN 100). To go out onto the Internet, frames have to go through a PPPoE sub-interface which is configured as below: interface ...
4
votes
1answer
3k views

PPPoE config with MTU

I wanted to check something about MTU size with PPPoE. Since PPP adds another 8 bytes, we should reduce our MTU to 1492 on our dialer interface. I wanted to actually test and do this, however I'm ...
4
votes
2answers
1k views

Issue getting Cisco 891 to connect to NTU via PPPoE

Other devices (MickoTik, Windows Laptop with builtin PPPoE client) seem able to connect to the NTU's PPPoE with no issue. Sanitized router configuration: ! ! Last configuration change at 06:55:18 ...
4
votes
1answer
1k views

SonicWall TZ210 PPPoE on WAN interface, need transparent bridging to DMZ

I've got a SonicWall TZ210 which connects to the WAN via PPPoE on the X1 interface. I've got a /29 subnet routed into the box, and everything is running fine. Now, I need to route one of the WAN IP ...
3
votes
1answer
280 views

Configuring PPPoE client/server

I have a lab where I would like to configure an PPPoE client and server. I have a ISP and a router device who are both connected to each other with the FaseEthernet0/1 interface. Client config: ...
3
votes
0answers
444 views

Policy Based Routing (not matching packets) - Virtual Template

I have this configuration runnning : Larger image I tested the policy based routing int the lab using two linksys router acting as ppp clients of the Cisco 7206VXR and another linksys emulating the ...
2
votes
1answer
1k views

Worst-case efficiency of PPP escaping mechanism

Will transferring over PPP data stream containing only reserved bytes 0x7E, 0xFF, 0x03 reduce bandwidth by 50% because of escaping? Then it seems to be very stupid if not say moronic. Such poor ...
2
votes
2answers
185 views

Simple question: Cisco 1750 AUX Port as “ADSL WIC”

I'm going to buy a Cisco 1750, but its lack the ADSL WIC Module. My question is, can I use the AUX Port to plug my RJ11 for DSL PPPoE Authentication? Like this: Cisco 1750 ISP --- AUX -----...
2
votes
1answer
831 views

PPPoE setup Cisco 881W

I've been trying to fix this myself but I'm afraid I can't. I've tried basically every tutorial already, but it still doesn't work. Can someone here write a tutorial on how to get PPPoE working with ...
2
votes
2answers
3k views

What does State PADISNT mean/stand for? (in CiscoRouter# show pppoe session)

I stumbled upon this while doing Person VUE Test Prep for CCNA and I came up with a question that google wasn't that helpful for. (This is just for curiosity, so a basic answer will do, but for others ...
2
votes
1answer
1k views

Load balancing among multiple PPPoE servers

What are the possible and efficient ways to load-balance users among multiple PPPoE servers? I have tried with VRRP. Is there any other efficient way?
2
votes
1answer
538 views

PPPOE Config not working

I have a Cisco 881-W router with Cisco IOS C880 Version 12.4(24)T5. For some reason I can't seem to get an IP on the Dialer. I'm probably doing something stupid wrong. Interface IP-...
2
votes
1answer
894 views

Need help with PPPoE Subscriber Management on a MX80

I've been working with Subscriber Management using DHCP and a FreeRadius server and have been quite successful. Of course, once my company heard that it is possible for customers to bring their public ...
2
votes
2answers
558 views

Cisco PPPoE over FA with L2TP client only (no IPSec)

This started as a question, with my connection failing to come up, but after a bit of trial and error, the configuration is working, so I've edited it into a solution. Access lists and address ...
2
votes
0answers
114 views

Not able to ping Dialer1 interface

I have setup a PPPoE server and client. I can't ping any IP address connected on the ISP router. I'm stil figuering out why that doesn't work. But the most simple problem currently is: I can't ping ...
2
votes
0answers
142 views

Router as PPPOE concentrator, PPPOE clients unable to get to DMZed static NAT server

I've been trying to figure out this problem, and I'm just not up to the task. I have a Cisco 2911 router as follows: Internet connection on GigabitEthernet0/1. Which has it's own static IP: A.B.C.38/...
1
vote
1answer
3k views

How does PPPOE bridging work?

How does the authentication take place in a pppoe bridge setup assuming I have a bridge modem and a router that is capable of maintaining a bridge connection both connected to an un-managed switch? ...
1
vote
2answers
443 views

What is PPPOE line protocol?

In serial wan connection we use PPP or HDLC line protocols,but where would we use PPPOE? What is Ethernet in this term 'PPPOE'?
1
vote
1answer
2k views

Can I use PPPoE and DHCP simultaneously?

In terms of subscriber management, I understand there are two major approaches - DHCP and PPPoE. I know I'm being very general, so give me some rope. If using DHCP, RADIUS/AAA will authenticate the ...
1
vote
1answer
140 views

Can an Ethernet port with an SFP handle a PPP/fiber line?

AT&T put in a 150 Mbps fiber line at our business (not my home). They claim it uses the PPP protocol (I am told this is non-Ethernet), but is terminated in multi-mode fiber using 1000BASE SX (an ...
1
vote
1answer
220 views

PPPoE Session Establishment

From what I have understood till now about PPPoE protocol. The CPE (RG) is the PPPoE client which connects to the BNG and establishes a session. The session is always alive unless the CPE is ...
1
vote
1answer
449 views

Why is L2TP based on PPP and not PPPoE?

I'm trying to grasp why L2TP is based on PPP. I thought PPP was a protocol for point-to-point situations where you don't have Ethernet. So why/how is L2TP using PPP in order to establish communication ...
1
vote
2answers
505 views

Fiber Network Bandwidth Control without Radius/PPPoE (Service Provider-Limit Client Bandwidth)

I have been reading and watching some information regarding fiber networks and their deployment. One interesting point that was raised was that in a fiber network generally a DHCP server is used for ...
1
vote
1answer
66 views

Link ADSL modem together [closed]

Is it possible to connect two (not more) ADSL modem together by using RJ11 in a local environment (ie: in a lab) ? +-------+ RJ45 +--------------+ RJ-11 +--------------+ RJ45 +-------+ | LAN 1 |...
1
vote
2answers
594 views

PPP, Ethernet and PPPoE differences

Correct me if I'm wrong. So, Ethernet technology is being primarily used in LANs. And we use PPP in serial links. To carry IP datagram, we can use either layer 2 technology, such as Ethernet, or we ...
1
vote
1answer
166 views

How Pppoe subscriber with static ip sends ipcp request

How a pppoe subscriber with static ip sends ipcp configure request. For dhcp the subscriber can include 0.0.0.0 in configure request of ipcp packet and obtain its ip from remote server. But in static ...
1
vote
2answers
531 views

No RADIUS Accounting for Particular Server

We have a VoD server that's directly connected to Juniper MX104 BNG. Juniper MX104 is also acting as a BRAS. Right now if any user accesses that VoD server, all the incoming and outgoing traffic is ...
1
vote
1answer
465 views

Cisco 7609 BRAS, mix NAT and public IP addressing for PPPoE clients

I would like to combine private and public addressing to PPPoE clients from a Cisco BRAS. Do you think is possible to do it using the same virtual template? If I define ip nat inside in the PPPoE ...
1
vote
2answers
1k views

Link layer protocols used by ISP?

Newbie networking question here... Do ISPs generally use the same link layer protocols (Ethernet, ARP to relate to network layer 3, etc.) that are used on LANs? In school I learned in some detail ...
1
vote
1answer
94 views

Addressing guest hosts

Suppose one wishes to provide guests with access to the Internet (and only the Internet) over one's network. For obvious reasons, switch ports will be assigned to a private VLAN created specifically ...
1
vote
1answer
855 views

How to decipher, why the pppoe interface has disconnected?

I am using a Ubiquity Edgerouter X, which is connected to a Draytek modem. This is the log from the pppoe interface: #######@ubnt:~$ show interfaces pppoe pppoe0 log Tue Jun 13 06:26:00 IST 2017: PPP ...