http://wiki.ciscolinux.co.uk/index.php?action=history&feed=atom&title=AWS%2FNetworking 2026-04-05T08:23:31Z Revision history for this page on the wiki MediaWiki 1.37.2 http://wiki.ciscolinux.co.uk/index.php?title=AWS/Networking&diff=4965&oldid=prev 2020-01-04T09:17:57Z

<p><span dir="auto"><span class="autocomment">Peerlink - unsupported configurations</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en-GB"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:17, 4 January 2020</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">=Subnets=</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">;Public subnet:</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">If a subnet’s default traffic is routed to an internet gateway, the subnet is known as a public subnet. For example, an instance launched in this subnet is publicly accessible if it has an Elastic IP address or a public IP address associated with it.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">;Private subnet:</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">If a subnet's default traffic is routed to a NAT instance/gateway or completely lacks a default route, the subnet is known as a private subnet. For example, an instance launched in this subnet is not publicly accessible even if it has an Elastic IP address or a public IP address associated with it.</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Peerlink - unsupported configurations =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Peerlink - unsupported configurations =</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Peerlinks are not transitive - use [https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html Transit Gateway] for this. The reason seems to be historical, that Peerlink connections allow you to ''link'' overlapping CIDR ranges eg.  </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Peerlinks are not transitive - use [https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html Transit Gateway] for this. The reason seems to be historical, that Peerlink connections allow you to ''link'' overlapping CIDR ranges eg.  </div></td></tr> </table>

Pio2pio http://wiki.ciscolinux.co.uk/index.php?title=AWS/Networking&diff=4134&oldid=prev 2019-06-06T20:00:13Z

<p>Created page with &quot;= Peerlink - unsupported configurations = Peerlinks are not transitive - use [https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html Transit Gateway] for this...&quot;</p> <p><b>New page</b></p><div>= Peerlink - unsupported configurations =<br /> Peerlinks are not transitive - use [https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html Transit Gateway] for this. The reason seems to be historical, that Peerlink connections allow you to ''link'' overlapping CIDR ranges eg. <br /> *VPC-A 10.0.0.0/16<br /> *VPC-B 192.168.1.0/24<br /> *VPC-C 192.168.1.0/24<br /> <br /> <br /> Allow you peerlink &lt;code&gt;VPC-B &lt;--&gt; VPC-A &lt;--&gt; VPC-C&lt;/code&gt;. Of course VPC-B does not have direct connection to VPC-C.<br /> <br /> <br /> ;Edge to Edge Routing Through a Gateway or Private Connection<br /> If either VPC in a peering relationship has one of the following connections, you cannot extend the peering relationship to that connection:<br /> *A VPN connection or an AWS Direct Connect connection to a corporate network<br /> *An internet connection through an internet gateway<br /> *An internet connection in a private subnet through a NAT device<br /> *A VPC endpoint to an AWS service; for example, an endpoint to Amazon S3.<br /> <br /> <br /> Edge to Edge Routing Through a VPN Connection or an AWS Direct Connect Connection<br /> :[[File:ClipCapIt-190606-205017.PNG]]<br /> <br /> Edge to Edge Routing Through an InternetGateway<br /> :[[File:ClipCapIt-190606-205204.PNG]]<br /> <br /> =References=<br /> *[https://docs.aws.amazon.com/vpc/latest/peering/invalid-peering-configurations.html Unsupported VPC Peering Configurations]</div>

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