This is one of multiple GNS3 labs videos. In this video we capture PPP Multilink frames using Wireshark.

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Tasks:
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1) Enable PPP between R1 and R2
2) Enable one-way PPP PAP authentication between R1 and R3 (R1 = server, R3 = client)
3) Enable PPP Multilink between R1 and R4
4) View debug commands to view the PPP negotiation
5) Use debugs and show commands to prove that PPP Multilink has negotiated successfully.
6) Use Wireshark to view to the Multilink negotiation.

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IOS used: c3725-adventerprisek9-mz.124-15.T14.bin
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GNS3 Topology:
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https://goo.gl/NMKouJ

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Resources:
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https://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10313-config-pap.html
https://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html